deletes trailing whitespaces

applies emacs' M-x delete-trailing-whitespace to all source files
fixes #1 (compatibility with wxPython > 2.8)

the wx._core._deprecated function is not available any more
in wxPython > 2.8. wx._core.deprecated is called instead, if available.
Merge remote-tracking branch 'origin/master'

* origin/master:
  fixes #1 (compatibility with wxPython > 2.8)

Conflicts:
	src/sogl/_composit.py
Merge pull request #6 from aheld84/master

fixes #1 (compatibility with wxPython > 2.8)