Restoring svn:ignore to WordPress.xcodeproj

git-svn-id: http://ios.svn.wordpress.org/trunk@4000 7d847f7c-ffe1-4a24-85be-b788d016d96a
Restoring more ignore setings, removing xcuserdata

git-svn-id: http://ios.svn.wordpress.org/trunk@4001 7d847f7c-ffe1-4a24-85be-b788d016d96a
Removing more empty directories

git-svn-id: http://ios.svn.wordpress.org/trunk@4002 7d847f7c-ffe1-4a24-85be-b788d016d96a