[YouTube] Support shortened "youtu.be" links.
+ Improved bad chars sanitation in filename.
See #656
[SimplyPremium] Updated API
Merges #655
[Filefactory] Improved free links detect
Merges #638
[Fshare] Fixed #651
[UpdateManager] rewritten
[UpdateManager] bump

Fix commit hash on the update manager server
[SimplyPremium] Fix #649
[UpdateManager] Fix removePlugins method
Spare fixes
[UpdateManager] Store new pyload's version number when a system update is available
Update FilepostCom.py
[SimpleHoster] Improve documentation of own public attributes
[RSDF] Improve code a bit (thx charlie89)
[Bitshare] Fixed #663
[ImgurComAlbum] new crypter
Merge w/ upstream/stable