Fix for getThumbnailTorrents
Fix refresh_partial for when infohash not in list
Ignore UnicodeDecodeError when torrent collecting
Add LibtorrentMgr.hasInstance check to retrieve_from_magnet
Fix
Merge pull request #595 from egbertbouman/small_fixes

Small fixes
Removed some blocking sql calls from gui
Merge pull request #598 from NielsZeilemaker/small_fixes

Removed some blocking sql calls from gui
change dispersy ref
change communities to use new statistics modules
adapt tribler to new dispersy statistics