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
```ucb_payoff_arm_name_list = [(self.get_ucb_payoff(sampled_arm, number_sampled), arm_name) for arm_name, sampled_arm in arms_sampled.iteritems()]```?