Mantle now moved to an Xcode Workspace.

Signed-off-by: Goffredo Marocchi <goffredo.marocchi@gamesys.co.uk>
Added MacOSX builder script.

Signed-off-by: Goffredo Marocchi <goffredo.marocchi@gamesys.co.uk>
Merge pull request #2 from Panajev/master

Mantle now moved to an Xcode Workspace.