Added multiple trial functionality, other minor changes

[Chryzanthemum]

multiple_trials - iterates over an array and uses online trial for each pair of bandits/payouts multiple_trials_bulk - sums up array of payouts to update choices, payouts without iterating est_payouts - added option to choose which bandit to see payouts for info - added number of bandits, number of wins for each bandit, and estimated payouts for each (wasn't sure why you wanted to put it under the bandit class) current - added current bandit choice (choices[-1])