Created PhysicsBox Entity
Collects a ColouredRectangle and a Farseer Rectangle
Probably need some more code later for access to stuff in it

Signed-off-by: Lewis Storey <iamlewisstorey@yahoo.com>
Fixed a problem with checking of bounds on _boxes
Cleared out the compiler warnings

Signed-off-by: Lewis Storey <iamlewisstorey@yahoo.com>