Add sitemap.  Modify robots.txt.
Merge pull request #103 from Ravenstine/sitemap

Add sitemap.  Modify robots.txt.
Add chromecast plugin for videojs.
Merge pull request #104 from Ravenstine/chromecast

Add chromecast plugin for videojs.
Merge pull request #3 from Ravenstine/master

Add chromecast plugin and sitemap.