Stable5

* A little fix(13c9e3a1a81c1b3acf3f2947e201516e64df8621) in the scanner which might not be able to find some tags. (The [comment] stuff, probably not necessary anymore, I wrote that for 5.0.4/5)
* (UGLY) The oc:// handler seems not to work particularly well with scanner. The extraction of the file size fails. When I point it to the physical file it works and the content-length header is properly filled(9877a3c1ebc063abb113aced8a92d8827d7c4ddc). However it has some drawbacks. 
* I also increased the timeout of the ampache sessions since it seems that all clients that I've tested can't handle expired session. Or they can handle it, but Owncloud doesn't send the correct message for expired sessions. (That are the http error code change from 400 to 401. I assumed that this the 'more correct' answer, but it won't fix the problem). (9a09b77c9fa935e396e74e3f28c6397b9ad8a5d8 and 1d7bf1ebe31c6ae0c564d1d79b198e5344160162)