Change Summoner v1.3 to take array input instead of multiple arguments

The current solution seemed to be geared toward hardcoding the Summoner ID / Name which would make dropping them into the function much simpler. To me, it seemed the more likely case would be pulling the IDs from a database or text file and thus would probably be easiest to pass an array into the new functions.

I'm new to Go so maybe there is something I'm missing so if I'm completely off base, feel free to let me know :)

Related to #15