Added Bandit BLA implmentation

********* PEOPLE *************
Primary reviewer: @sc932 

Reviewers: @suntzu86 

********* DESCRIPTION **************
Branch Name: norases_373_bla_bandit
Ticket(s)/Issue(s): #373 

********* TESTING DONE *************
make test
make style-test
no loss is amount loss. Before it was you lose 1 if you fail, and win 1 if you succeed. Now it is Bernoulli arms where you lose 0 if you fail and win 1 if you succeed.