Kronos: Changes to gameData .java and xml files

- Added a placholder image icon in assets/summonerspells (could be used
as placeholder for other files.
- Added summoner spells to assets
- Added ImageViews to the gameData XML files for summoner spell icons
- Updated gameData.java to display Summoner Spell icons instead of plain
text.
- Edited win/loss text to better fit the flavor of the game.

TODO: Format time  from MMSS to MM:SS (needs to account for different
time strings, such as MMM:SS or :SS