GM can now invite players to the game
Users can now see game invites
Created utility function for edn-responses
Users can now join games when invited
Fix 404 when user views game he is in
Hide invites when none
Store name while waiting for user to join
Make character sheet a generic component
Add character sheet to game-view
Don't return to index after saving game
Only allow the GM to save the game
Players can only see their own character, not everyone elses
Fixed queries for retrieving games and invites
Redirect to index when creating game, but not on edit
Fixes #15: In-game character editor