Add newlines to fix Xcode Build Errors

Hey,
I really like the API that FLKAutoLayout exposes and would love to use it with my project.

Unfortunately I enable all build warnings by default and treat warnings as errors, and FLKAutoLayout doesn't work with this due to its omission of new lines at the end of files (the C standard says that "a source file that is not empty shall end in a new-line character...", which means the omission is treated as a warning).

This PR fixes those issues by adding newlines to the end of the files.