Added ActivityIndicator to bottom of SummonerVC

When user reaches bottom of summoner VC, activity indicator should roll.
Changed background colors accordingly.

Instead of removing tableView separators from code, done in storyboard now.
Temp made footer activity indicator spin on reaching last cell.

TODO: make it so that more cells are loaded.
     (maybe make it wait like 0.5s so that cells aren't loaded instantly)
Merge branch 'dennis' into chris