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
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: 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
STY: remove unused imports in plot_directive
STY: pep8 2 lines between functions

pep8 for plot directive.
MNT: remove Python 2.7 copy of relpath

Matplotlib now depends on Python 2.6, which has relpath