Updated ThumbItemtest and removed Torrent and Torrentmanager tests
Updated poller to be threadsafe and fixed and made sure no polling directly stops when pausing. Also tried to make a unit test for poller, but failed to get it running.
Updated XMLRPCManagers:

-Improved error messages in XMLRPCDownloadManager
-Made the pollers wait for the previous call to return
-Changed to polling interval to 500ms for torrents and channels. Kept it on 2000 for downloads.
-Connected to 127.0.0.1 instead of localhost, which should be faster