Adding the new post process build script to the unity packages folder. This should rectify an issue that was arising as a side effect of the xcode unity editor github project that's floating around. The issue it resolves specifically is that when the xcode editor project is run before adcolony's post process build it strips out comments that were being used to identify which locations in the file was a specific section. Because of this a section parser was created in order to identify the correct locations to perfom the project section injections. This was tested against the Facebook Unity plug-in and should work without issue.