Creating a FleetAllocation allocated a GameServer from a Fleet

This implements the FleetAllocation CRD, that when created
looks at the requested Fleet, and marks one of the
GameServers as Allocated (if available) and returns it's value
in the FleetAllocation.

This also includes a quickstart and spec for reference as well.

Some refactoring was included in the PR (probably should have been
a seperate PR for that).