Admin add video

1) add admin new video page
2) secure access to admin only
3) separate controllers to take advantage of actor roles (authenticated->admins)
4) specs for admin add video
5) feature spec for admin adds video and user checks
6) update seeds
7) add s3 support, gem fog, gem mini_magick, gem carrier wave
8) add gem figaro
You can move the `Category.all.map....` into a helper