Request a specific version of Gtk when using gi
On Linux, use the XDG base directory specification for configuration and cache directories
Tests starting with a c are all now PEP8 compliant.
Most tests starting with a are now PEP8 compliant.
All tests starting with a p now PEP8 compliant.
Only display warning when config file (not config directory) still exists.
Reverted PEP8 fix on bbox_tight test.
Let _pcolorargs handle the shape of C, checking compatibility with X and Y
Fix error in test_pre_transform_plotting.

This error was revealed by the new checking in _pcolorargs.
Add comment and test for _pcolorargs
pgf: add mixed mode rendering
fixes on MixedModeRenderer for non-72dpi figures
mlab.FIFOBuffer: remove fossil line referring to nonexistent method
[DOC] Mathtext and matshow examples
Merge pull request #1975 from pwuertz/pgf_mixedrenderer

MixedModeRenderer non-72-dpi fixes & Pgf mixed rendering
BUG: pass kwargs to TimedAnimation
Added the from_levels_and_colors function.
Merge pull request #2065 from efiring/FIFOBuffer_bug

mlab.FIFOBuffer: remove fossil line referring to nonexistent method
Add shape information to error message
Merge branch 'pcolorargs'