calabash.framework now includes arm64/x86_64 slices

* calabash-ios/calabash-cucumber rake task no longer clobbers symlinks
  when building the calabash.framework
upgraded project file to next Xcode
resolved compiler warnings re: 32/64 bit and double/float
refactored to objc modern
fixing up some features
updating cucumber env to test issue 313
should not be deleting the xamarin/ if args say not to
updating my RM dictionary
Merge pull request #13 from jmoody/feat/integration-with-xc51

modernized the project, refines cukes, and includes calabash.framework with 64 bit slices