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
also, at some point we're going to want to bump the software versions in min_reqs. How will that interact with the MOE version numbers? i.e., MOE v1.3.4 might not work with the original min_reqs