Use a subdirectory of $XDG_CONFIG_HOME instead of ~/.matplotlibrc on Linux#454

Merged

mdboom merged 2 commits intomatplotlib:masterfrom

mdboom:xdg_config

May 28, 2013

Commits on May 22, 2013

On Linux, use the XDG base directory specification for configuration and cache directories
mdboom
committed

Commits on May 24, 2013

Only display warning when config file (not config directory) still exists.
mdboom
committed