Validate Project Settings for Git!

Not submodules.
Target ObjectiveGit-iOS not ObjectiveGit-iOS-arm64.
Bump ObjectiveGit and make nesscery API changes.
Use correct values for `USER_HEADER_SEARCH_PATHS`

Remove some cruft as well.
Merge pull request #9 from PiersonBro/fix-build

Xcode 5.1 Support