Merge branch 'hotfix/0.7.1.1'
Merge branch 'release/0.7.2'
Merge branch 'release/0.7.3'
Merge branch 'release/0.8.0'
Update README.md

update url of demo moview
impress
Merge branch 'master' into develop
'3 types of playlists' concept

change playlists view and config file, specs acording to the concept.
update README acording to 'three types of playlists' concept.
Merge branch 'feature/three_types_of_playlist' into develop
optimize silent audio
0.8.1
Merge branch 'release/0.8.1' into develop