Implementing Cache Busting for guess requests

Fixes #2
Ditching $resource wrapped requests and moving to pure Angular $http request wrapper

Due to fixes #2 -- ditched the $resource wrappers for the GET methods and stuck them into pure $http wrapper. More control over the requests.
Finishing up.

Adding error message capability for most requests -- when game info is requested and fails, when a card guess is made and fails, etc (usually result of ended game)

Added end-game message -- either success or fail.

Minor cleanup.