Some initial changes for SummonerVC
Added new prof icons
SummonerVC now uses SummonerManager.

VC's data is no longer from DataManager,
but DataManagaer's methods have not yet been deleted.

Upon pushing a SummonerVC, the newly pushed VC immediately
calls its SummonerManager to refresh matches asynchronously.
Once the fetching is done, SummonerManager gives VC
the matches and VC updates header & reloads tableview.
NOTE: during this time an activity indicator should show.
Right now, the speed is too fast to notice, but under
slow internet connections, UI will respond, but will not
tell the user of what is happening.

TODO: Detect scroll of TableView to load more matches
once user hits bottom of the match history.