Updated shaders in Ship game sample.

Although in Blur.fx , the Sample method is allowed on a Texture2D, in the rest it is not.  No idea why.

Sample now fails in GraphicsDevice throwing a NotImplemented Exception around something to do with previousRenderTargetBindings
*At time of test bug found in Win8 MG solution - PresentParams vs PresentParams.PresentInterval
Merge branch 'samples.ShipGame' of https://github.com/DDReaper/MonoGame-Samples into samples.ShipGame