BUG : fixes FontProperties memory leak

According to the data
model (https://docs.python.org/2/reference/datamodel.html#object.__hash__)
objects that define __hash__ need to define __eq__ or __cmp__.  By
default, all user defined classes have a __cmp__ which evaluates to
False for all other objects.

Previously we do not define either __cmp__ or __eq__ on FontProperties,

This results in never finding the property
cached in the dict, hence the growth in the number of
FontProperties (and I assume the stuff in them).

By adding __eq__ and __ne__ we complete the data model and adding
FontProperties to dictionaries should work as expected.

This was not a problem before, but in #3077 the caching key was changed
from hash(prop) -> prop.

Closes #3264
TST: Fix ImportError: No module named 'mpl_toolkits'

Apparently `imp.find_module` does not support namespace packages.
Fixes issue #3252.
Merge pull request #3275 from cgohlke/patch-5

TST: Fix ImportError: No module named 'mpl_toolkits'
Merge pull request #3274 from tacaswell/fix_fontprop_leak

BUG : fixes FontProperties memory leak
DOC : removed out-dated git advices

It is a bad idea to all push directly to the same repo/branch, that
way lies madness/cvs

closes #3280
Merge pull request #3235 from jenshnielsen/more_warnings

Silence some more warnings
Use the interpolation parameter in make_thumbnail
Merge pull request #3295 from WeatherGod/make_thumbnail_fix

Use the interpolation parameter in make_thumbnail
MNT : better error handling on determining gs version

If we fail to parse the version string return (0, 0) to let
the code for dealing with out-of-date versions of gs handle
the case of not installed.