added video card mixin and styled 'my videos' and 'bookmarks' pages on dashboard
Merge pull request #67 from zsherman/dashboard-pages

Video card mixin and 'my videos' and 'bookmarks' pages on dashboard
Merge pull request #68 from maxgillett/upload_form

public s3 urls are now generated
reset css fix
retina icons + images, upload page styling, multiple file uploads, tabbed upload form