Clytwynec/rake2paver acceptance

@jzoldak @benpatterson  @minhtuev 

This is ready for review. I've been waiting on [TE-410](https://edx-wiki.atlassian.net/browse/TE-410), but since 2 of you are out next week, It may be good to get this through before then.  Please review when you get time.

(Documentation changes pending.)