Renamed to_plist to to_hash since it will always return a hash, and not a valid plist string (XML, JSON or otherwise).
Merge branch 'master' of https://github.com/mtitolo/Xcodeproj into mtitolo-master

* 'master' of https://github.com/mtitolo/Xcodeproj:
  Renamed to_plist to to_hash since it will always return a hash, and not a valid plist string (XML, JSON or otherwise).

Conflicts:
	lib/xcodeproj/project.rb