Public docker image live, updated docs

********* PEOPLE *************
Primary reviewer: @suntzu86 

Reviewers:

********* DESCRIPTION **************
Branch Name: sclark_332_set_up_public_docker
Ticket(s)/Issue(s): Closes #332 

********* TESTING DONE *************

Tested on dev and personal linux box
1. They don't. OSX builds everything locally. I'll update with min reqs. Forgot about that ><

2. alpha only, lowercase only :/

3. OK, I'll update. Thought we were going to wait until we had >1.

4. if you follow the above moe_container will have a container built off master. 0.1.0 is as of right before your tag.