AppCode specific files added to ignore-list
Remove the Podfile.lock from the default gitignore

We no longer need to ignore this as of CocoaPods 0.17. We originally
ignored the file because of merge conflicts that were caused by CocoaPods
reordering the lock file on write, but that issue has been resolved and
we haven't seen any continuing issues in testing.

Fixes #30
Bump version: 0.7.2
Add xccheckout files to gitignore
Add new clang warnings
Bump version: 0.7.5
Properly require version information
Bump version: 0.7.6
Bumping xcodeproj version and change code accordingly
Merge branch 'master' of github.com:Ashton-W/liftoff