Add hls stream
Improve Plex video stream & transcode
Fix subtitle stream on web player
Merge pull request #365 from Psy-Virus/develop

Ger translation update due to latest changes.
Fix travis build
Add album / artist / song / playlist edit from Plex backend
Add Plex edition on missing library items
Fix song stats insertion
Don't force to have an image on "Albums of the moment"
Fix Plex thumb art
Fix album share from album row (fix #368)
Fix Movie/Show section arts
Replace iframe with Ajax page loading :) :)
Fix phpfix javascript visibility
Fix player artist/album ajax links
Fix Albums and Similars Artists ajax load (fix #375)
Ajax load php pages only
German translation + lang catalog updated due to latest changes :-)

+ one little Ger wording correction