http://stackoverflow.com/questions/17650138/ios-ipa-file-size-xcode-archive-vs-xcodebuild-command

DEPLOYMENT_POSTPROCESSING
https://developer.apple.com/library/mac/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html#//apple_ref/doc/uid/TP40003931-CH3-SW53