Fixing UCB1 and UCB1-tuned algorithm calculation of upper confidence bound
Updated youtube links
Merge pull request #433 from serchaos/serchaos_432_fix_ucb_algorithm_calculation

Fixing UCB1 and UCB1-tuned algorithm calculation of upper confidence bound
Merge pull request #434 from Yelp/sclark_update_youtube_links

Updated youtube links