Points now stored on level reset.

Treamill now can stop and start and be reset.
GameManager holds data about player's currency
and maintains the state of the game.
Adding objects, cameras, and behavior to go to store.

Store is just a static screen at the moment.
This included giving state (gameScreen) to our GameManager.
Implemented Items as Scriptable Objects. ItemDatabase added.

The ItemDatabse is a hashtable of item names and Item objects.
This contains data about items without the overhead of the
monobehavior items in the shop.
ItemDatabase removed. Scrolling between items supported.

Instead of doing items as scriptable objects we will do
them as prefabs with attached Item scripts.
Renamed ItemCollection Inventory, behavior is the same.
Merge branch 'master' of github.com:redbluestudios/game-off-2013

Conflicts:
	Assets/Scripts/Treadmill.cs
Merge branch 'store'

Conflicts:
	Assets/Scripts/Strings/Tags.cs
	ProjectSettings/TagManager.asset
Scene changes to support latest merge.