A more robust algorithm for automatically looking up a project when adding a file to a project.
If fusion is not available, catch the exception. In addition, allow for direct assembly lookups - previously, if an assembly reference was a full path it might not be added, even if it existed.
Arg. Xamarin is trying to make me go mad with its tab settings.
Merge pull request #28 from bbbscarter/master

A couple of fixes for loading Unity projects on OSX, and adding files to projects