Add Bandits to moe examples

********* PEOPLE *************
Primary reviewer: @sc932 

Reviewers: @suntzu86 

********* DESCRIPTION **************
Branch Name: norases_386_add_bandits_to_moe_examples
Ticket(s)/Issue(s): #386   

********* TESTING DONE *************
make test
make style-test
Let's manually define this here. I imagine people will want to copy paste and modify parameters (vs having to go to the constants file).

Let's also add a comment about what BernoulliArm means (even if it just says something about them being binary rewards)