replaces epd and pythonxy with anaconda and canopy. Also, added some notions in
the readme.osx
adds dyld_fallback_library_path
removing pythonxy
reformatting for line length
redhat->linux
drops pylab reference
getting rid of extra space
both are good distributions
conda libpng and freetype don't help
working on guide for choosing colormaps. Have overview section and start on a few others.
added colormaps guide to beginner guide
DOC : change how OO/pyplot/pylab is addressed

I assume this will be controversial

Addresses #3115
DOC : grammer fixes and doc edits

 - removed from pylab import *
 - changed some wording
DOC : edits to usage_faq.rst
Two
moves libpng from optional to required
TST: Fix test_backend_ps failures on Windows
TST: do not remove files while they are open

Fixes WindowsError: [Error 32] The process cannot access the file because it is being used by another process
BUG: do not remove file if passed in file object

Fix WindowsError: [Error 32] The process cannot access the file because it is being used by another process
TST: On Windows open files can not be removed