Update video.js references to 4.11.2 and ads-contrib to 0.5.0.

Update video.js references to 4.11.2 and ads-cotnrib to 0.5.0
Merge pull request #36 from shawnbuso/vjs_11

Update video.js references to 4.11.2 and ads-contrib to 0.5.0.
Merge branch 'master' into gh-pages