Making iOS Deployment Easy http://mstrick.com/making-ios-deployment-easy/

Gemfile

source 'http://rubygems.org'

# Make sure you have bundler installed
# gem install bundler

gem 'shenzhen'

Rakefile

PROJECT_SCHEME = '' # Your Project scheme for building ex MyApp
PROJECT_NAME = '' # Your Project file name ex. MyApp.xcodeproj
API_TOKEN = '' # Your TestFlight API Token
TEAM_TOKEN = '' # Your TestFlight Team Token
INTERNAL_LIST = '' # TestFlight list of people you want to notify internally
RELEASE_LIST = '' # TestFlight list of people you want to notify for release

desc 'Build Handset IPA'
task :buildipa do
  sh "rm -rf *.ipa"
  sh "rm -rf *.app.dSYM.zip"
  sh "ipa build --scheme #{PROJECT_SCHEME} --project #{PROJECT_NAME} --configuration Release --clean /tmp"
end

desc 'Deploy Internal Build to Testflight'
task :internal => ['buildipa'] do
  sh "ipa distribute:testflight --api_token #{API_TOKEN} --team_token #{TEAM_TOKEN} --lists #{INTERNAL_LIST} --notify --notes 'Internal Release' "
end

desc 'Deploy Release Build to Testflight'
task :release => ['buildipa'] do
  sh "ipa distribute:testflight --api_token #{API_TOKEN} --team_token #{TEAM_TOKEN} --lists #{RELEASE_LIST} --notify "
end

def revBuild(plistFile)
  puts "Attempting to update #{plistFile} build version..."
  oldVersion = `/usr/libexec/PlistBuddy -c "Print CFBundleVersion" #{plistFile}`
  puts "The old version: #{oldVersion}"

  versionParts = oldVersion.split(".")
  previousDate = versionParts[2]
  newDate = Time.now.strftime("%Y%m%d")

  versionParts[2] = newDate
  versionParts[3] = previousDate == versionParts[2] ? (versionParts[3].to_i+1).to_s : "1"

  versionParts.each do |part|
    part.chomp!
  end

  newVersion = versionParts.join(".")
  
  `/usr/libexec/PlistBuddy -c "Set :CFBundleVersion #{newVersion}" #{plistFile}`

  puts "The new version: #{newVersion}"
end

desc "Rev the build numbers in a project's plist"
task :rev do
  revBuild './path/to/my.plist'  
end