first step to the big video

missing:
- thumb
- refactor js code
Merge branch 'master' of https://github.com/catarse/catarse into channel-big-video
animation tests
Merge branch 'master' of https://github.com/catarse/catarse into channel-text-changes
fix url on channel submit project
fix assets on home screen #61570548
color on separator line at login box
fix position of show password
change video embed to thumbnail and add play button
show and close video with slide
close video button
merge - work was happening on two branches
Merge pull request #563 from pedromarins/channel-big-video

close video button