- add "mergeDatesPlayed" to take in two jsonArrays, merge their content into one unique list, and add todays date
- also, weed out any dates that are older than the users "oldest date" preference
- when the numberOfTimesPlayed data is returned from the server, merge it with the local data, and send the result back up to the server and save it into the DB

Change-Id: I12e2c0b77bd4f98bc9e93f03fb18be441be43158