Update to iOS 7

This does a few things, which may or may not be desirable in the general project. It updates the project to remove JSONKit which appears to be minimally maintained. It updates deprecated function calls which are deprecated in iOS6/7 and fixes a reference in a XIB to a missing Drupal Gardens (grass) file which also updated that XIB to a Xcode 5 format at the same time.

This, therefore, removes compatibility with earlier iOS versions. I'm not sure what the overall direction of the project should be or what the thoughts are on maintaining compatibility with downlevel OS versions but for my tinkering I'm most interested in the current versions.

Finally this is not fully tested. It works for some basic functionality but not every case has been tested.