adding github-embed by leewillis77

git-svn-id: https://plugins.svn.wordpress.org/github-embed/trunk@662995 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge branch 'master' of github.com:leewillis77/wp-github-oembed
Docs andd potential github/wp deploy script