Add a 'Squared.Render.Convenience' namespace containing utility classes and extension methods to make using the library easier:
  RenderStates contains some predefined useful blend/rasterizer states
  MaterialUtil makes it easier to construct DelegateMaterials
  Material.SetStates wraps a material with a begin delegate that sets various states on the device
  BitmapRenderer simplifies creating a bitmapbatch to draw a single bitmap (and can be initialized with default argument values)