Created Z Sorting button in Skeleton and separated from Use Shadows, this way a user can use Z sorting with a different non-shadows shader.  Added error messages for saving/loading children positions in Skeleton.  Separated buttons and made notices to the user on if Z Sorting or Shadows were enabled.  Check for null objects in restoring poses.  Updated scripts to be compatible with WP8.  Added Generate Material Asset button to Skin2D for creating a new material asset from the current material.  Added Banbury's Create Ragdoll menu item.