Fixed some indentation (tab -> spaces)
Each directory shows active status

If you have a number of bittorrent sync folders, it is not
straight-forward seeing which one of them is responsible for the sync
icon being active. This patch shows you in the first level menu which
shares are active using icons before the share name.
Added cpbotha to CREDITS
Merge branch 'per_folder_activity' of git://github.com/cpbotha/btsyncindicator into cpbotha-per_folder_activity
Changed per-folder indicator for no activity from o to horizontal bar