Add 5 seeded games instead of 1

I'm going to start working more on the index and on the 'create new
game' functionality, and having multiple games to start with will allow
me to test the index before building the 'new' game feature.
Rename GameServerActions to GameServerActionCreators

This file now follows the same naming convention as the other actions
file, GameGridActionCreators, which was inspired by the chat example
from the flux repository.
Trigger change in currentGame from click of index

For now it seems like good organization to have a separate actions file
for both our views, even though each of them only takes one action.

Next steps:
 - Load the currentGame in the EcosystemGrid when it changes
 - Add better styles for the GamesIndex (style like a tabbed
   navigation?)