Added file versions to directory listing.
Merge branch 'refactor' into drive_split

Conflicts:
	src/maidsafe/drive/local/local_drive.cc
Merge branch 'drive_split' of github.com:maidsafe/MaidSafe-Drive into drive_split
Merge branch 'drive_split' of github.com:maidsafe/MaidSafe-Drive into drive_split

Conflicts:
	src/maidsafe/drive/directory_listing.cc