Dynamically Pull And Create Apex Class From Github

DynamicApexClassCreator.cls

HttpRequest req = new HttpRequest();
req.setEndpoint('https://raw.githubusercontent.com/swapnilshrikhande/nanoservices-libs/master/src/classes/HTTPNanoService.cls');
req.setMethod('GET');
Http http = new Http();
HTTPResponse res = http.send(req);

Map<String,String> createClassMap = new Map<String,String>{
      'Name' => 'ExternalCalculatorNanoService'
    , 'Body' => res.getBody()   
};

String createClassBody = JSON.serialize(createClassMap);

HttpRequest sendReq = new HttpRequest();
sendReq.setEndpoint('https://ap15.salesforce.com/services/data/v28.0/sobjects/ApexClass');
sendReq.setBody( createClassBody );

sendReq.setMethod('POST');
sendReq.setHeader('Authorization', 'Bearer ' + UserInfo.getSessionID());
sendReq.setHeader('Content-Type', 'application/json');

Http httpObj = new Http();
HTTPResponse result = httpObj.send(sendReq);
System.debug(result.getBody());