Kin

- Improve parser to handle more valid cases
- Make kin throw an error when there are two or more possible project.pbxproj (Error code -3)

Kin now returns an exit code if it finds any error, specifically:
- Error code -1 iff kin finds an error in the target project.pbxproj file
- Error code -2 iff kin cannot locate any project.pbxproj

Kin now tries to find a valid project.pbxproj from your current directory by looking for a file called `project.pbxproj` in any directory ending in `.xcodeproj`

Simplified usage: `kin myapp.xcodeproj/project.pbxproj`

- Basic functionality