[PyBinding] Add pathbar support to PyBinding.

License: MIT/X11
Merge branch 'master' of github.com:Unity-Technologies/monodevelop
Merge branch 'master' of github.com:Unity-Technologies/monodevelop
Merge branch 'master' of github.com:Unity-Technologies/monodevelop
Merge branch 'master' of github.com:Unity-Technologies/monodevelop