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. why do linux and os x pull different docker images? if the only difference was having docker autolaunch the server, let's just drop that.

2. yelpmoe vs yelp_moe?

3. what happened to having a /latest? Having to update version #s in so many places is going to lead to somebody forgetting.

4. what is in moe_container vs yelpmoe/v0.1.0?