video playlist support
support video playlist
add title input field for video
add title field
DB schema optimization wave 3

1) Make uuid unique
2) Add default values instead of restricting min length to desc, album, artist and title.
3) Remove uri attribute, which is duplicated to uuid.
Merge branch 'master' of http://git.oschina.net/luohao-brian/phonecms
Strip text length in object list views.
Optimize default values for audio/video metadata
Optimize css style for video views
Merge branch 'master' of http://git.oschina.net/luohao-brian/phonecms
Use duration and resolution for video item view.
Add screenshot poster to jplayer