adding video
Merge pull request #32 from craigspaeth/master

@mzikherman: Image upload
Merge branch 'master' of github.com:artsy/positron into video
adding video
video sections
tests
passing tests
unecessary... maybe semaphore will like this better
maybe drop will properly remove things
Merge pull request #33 from craigspaeth/sections

@gib: User can add video to articles