Added Bandit UCB1-tuned implementation

********* PEOPLE *************
Primary reviewer: @sc932 

Reviewers: @suntzu86 

********* DESCRIPTION **************
Branch Name: norases_366_ucb1_tuned_bandit
Ticket(s)/Issue(s): #366  

********* TESTING DONE *************
make test
make style-test
general question: how specific/discerning are these tests? Like if I replaced an instance of UCB1-tuned with epsilon-first, would the tests fail? Would they fail if I replaced UCB1-tuned with UCB1?