Torrentshack plugin code cleanup, session persistence between searches, fix for unhandled exception when there was no category configured
Fix rendering content_filename in transmission plugin. Fix #2714
Sceneaccess plugin: Add docstring for process_categories method, session persistence across searches
Merge pull request #345 from crawln45/develop

Fix rendering content_filename in transmission plugin. Fix #2714
Error properly when content_filename is used with transmission <2.8