Added a simple example!

test.py:
* example / test file

pyglame/__init__.py:
* _trace_restrict will now include the calling script... hopefully.

pyglame/surface/__init__.py
+ DisplaySurface
  * used for a windows display surface, you can't (and shouldn't) get
    sub-regions of this surface.

pyglame/window/__init__.py
  Window:
  + added get_surface function & surface property to return the DisplaySurface

pyglame/window/pygame/__init__.py
  PygameWindow
  + added code to handle creation/modification of DisplaySurface object.