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Crowdsale.sol

pragma solidity ^0.4.10;

import 'gist/ERC223ReceivingContract.sol';
import 'gist/SafeMath.sol';
import 'gist/StandardToken.sol';
import 'gist/Ownable.sol';

contract Crowdsale is Ownable {
    using SafeMath for uint;
    
    StandardToken public dollar;
    StandardToken public vote;
    uint public price;
    
    event Buy(address _beneficiary, uint _amount);
    event Round(uint _stage, uint _tokensRem, uint _newPrice);
    
    modifier validPurchase {
        require(msg.value > 0);
        require(tokensAvailable() > 0);
        _;
    }
    
    modifier hasEnded {
        if (tokensAvailable()!=0) revert();
        _;
    }
    
    function Crowdsale() public {
        /**
        * We choose to have the crowdsale deploy the tokens 
        * This guarantees the highest level of transparancy
        * since it makes the crowdsale contract the owner of the tokens
        * rather than the creator of the crowdsale contract
        * */
        price = 1 ether;
        dollar = new StandardToken("Howest Dollar", "HWD", 18, 2000000000000000000000000);
        vote = new StandardToken("Howest Vote", "HWV", 18, 500000000000000000000000);
        StandardToken(dollar).transfer(owner, 500000000000000000000000);
    }

    //Fallback
    function() public {
        return buyFor(msg.sender);
    }
    
    function buy() public {
        return buyFor(msg.sender);
    }
    
    function buyFor(address _beneficiary) public payable validPurchase{
        uint amount = msg.value.div(price);
        if (amount <= StandardToken(vote).balanceOf(this)) {
        StandardToken(dollar).transfer(_beneficiary, amount);
        StandardToken(vote).transfer(_beneficiary, amount);
         Buy(_beneficiary, amount);
        } else {
            if (StandardToken(vote).balanceOf(this) != 0) {
                StandardToken(dollar).transfer(_beneficiary, amount);
                StandardToken(dollar).transfer(_beneficiary, StandardToken(vote).balanceOf(this));
                price = 2 ether;
                Round(2, StandardToken(dollar).balanceOf(this), price);
                Buy(_beneficiary, amount);
            }
            StandardToken(dollar).transfer(_beneficiary, amount.div(2));
            Buy(_beneficiary, amount.div(2));
        }
       
        forwardFunds();
    }
    
    function forwardFunds() internal {
        owner.transfer(msg.value); //exception on failure
    }
    
    function tokensAvailable() public view returns (uint256) {
        return StandardToken(dollar).balanceOf(this);
    }
    
    function kill() public hasEnded onlyOwner {
        selfdestruct(owner);
    }
}

ERC20.sol

pragma solidity ^0.4.10;

interface ERC20 {
    function name()
        public
        view
        returns (string);

    function symbol()
        public
        view
        returns (string);

    function decimals()
        public
        view
        returns (uint8);

    function totalSupply()
        public
        view
        returns (uint256);
        
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

ERC223.sol

pragma solidity ^0.4.10;

interface ERC223 {
    function transferAndCall(address to, uint value, bytes data) public returns (bool);
    event TransferAndCall(address indexed from, address indexed to, uint value, bytes indexed data);
}

ERC223ReceivingContract.sol

pragma solidity ^0.4.10;

contract ERC223ReceivingContract { 
    function tokenFallback(address _from, uint _value, bytes _data) public;
}

Ownable.sol

pragma solidity ^0.4.10;

contract Ownable {
    address public owner;
    
    function Ownable() public {
        owner = msg.sender;
    }
    
    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }
}

SafeMath.sol

pragma solidity ^0.4.10;

library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

StandardToken.sol

pragma solidity ^0.4.10;

import 'gist/SafeMath.sol';
import 'gist/ERC20.sol';
import 'gist/ERC223.sol';
import 'gist/ERC223ReceivingContract.sol';

contract StandardToken is ERC20, ERC223 {
  using SafeMath for uint;
     
    string internal _name;
    string internal _symbol;
    uint8 internal _decimals;
    uint256 internal _totalSupply;

    mapping (address => uint256) internal balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    function StandardToken(string name, string symbol, uint8 decimals, uint256 totalSupply) public {
        _symbol = symbol;
        _name = name;
        _decimals = decimals;
        _totalSupply = totalSupply;
        balances[msg.sender] = totalSupply;
    }

    function name()
        public
        view
        returns (string) {
        return _name;
    }

    function symbol()
        public
        view
        returns (string) {
        return _symbol;
    }

    function decimals()
        public
        view
        returns (uint8) {
        return _decimals;
    }

    function totalSupply()
        public
        view
        returns (uint256) {
        return _totalSupply;
    }

   function transfer(address _to, uint256 _value) public returns (bool) {
     require(_to != address(0));
     require(_value <= balances[msg.sender]);
     balances[msg.sender] = SafeMath.sub(balances[msg.sender], _value);
     balances[_to] = SafeMath.add(balances[_to], _value);
     Transfer(msg.sender, _to, _value);
     return true;
   }

  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
   }

  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
     require(_value <= balances[_from]);
     require(_value <= allowed[_from][msg.sender]);

    balances[_from] = SafeMath.sub(balances[_from], _value);
     balances[_to] = SafeMath.add(balances[_to], _value);
     allowed[_from][msg.sender] = SafeMath.sub(allowed[_from][msg.sender], _value);
    Transfer(_from, _to, _value);
     return true;
   }

   function approve(address _spender, uint256 _value) public returns (bool) {
     allowed[msg.sender][_spender] = _value;
     Approval(msg.sender, _spender, _value);
     return true;
   }

  function allowance(address _owner, address _spender) public view returns (uint256) {
     return allowed[_owner][_spender];
   }

   function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
     allowed[msg.sender][_spender] = SafeMath.add(allowed[msg.sender][_spender], _addedValue);
     Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
     return true;
   }

  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
     uint oldValue = allowed[msg.sender][_spender];
     if (_subtractedValue > oldValue) {
       allowed[msg.sender][_spender] = 0;
     } else {
       allowed[msg.sender][_spender] = SafeMath.sub(oldValue, _subtractedValue);
    }
     Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
     return true;
   }
   
  function transferAndCall(address _to, uint _value, bytes _data) public returns (bool) {
    require(_value > 0 );
    if(isContract(_to)) {
        ERC223ReceivingContract receiver = ERC223ReceivingContract(_to);
        receiver.tokenFallback(msg.sender, _value, _data);
    }
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        TransferAndCall(msg.sender, _to, _value, _data);
        return true;
    }
    
  function isContract(address _addr) private view returns (bool is_contract) {
      uint length;
      assembly {
            //retrieve the size of the code on target address, this needs assembly
            length := extcodesize(_addr)
      }
      return (length>0);
    }


}