added some fixes in order to use the result obtained from mpl._get_configdir() [backport to 1.4.2-doc]

[kikocorreoso]

The docs show the folder ~/.matplotlib/stylelib as the folder to find user defined style sheets but the result from:

import matplotlib as mpl
print(mpl._get_configdir())

indicates that the folder should be:
~/.config/matplotlib/stylelib
(

matplotlib/lib/matplotlib/style/core.py

Line 32 in 980e4cd

USER_LIBRARY_PATHS = [os.path.join(mpl._get_configdir(), 'stylelib')]

)

This PR just fix this in the docs (http://matplotlib.org/users/style_sheets.html)

I followed the process of the docs to make this PR but it is the first time so if there is somethiing wrong, please, let me know.

If I am wrong about the PR just discard it and sorry for the noise.

[tacaswell]

Blah, this is a result of our configuration system being too flexible and trying to gracefully move to following XDG. ~/.matplotlib is the old path, ~/.config/matplotlib is the default XDG-complaint path.

The actual path is also controlled by two different ENVs.

The docs should probably be change to

file to ``mpl_configdir/stylelib``.  By default ``mpl_configdir`` should be 
``~/.config/matplotlib``, but you can check where yours is with 
``matplotlib.get_configdir()``, you may need to create this directory.

cc @tonysyu

[tonysyu]

On my system (OSX), this is actually ~/.matplotlib. There's probably no general way to explicitly write the path for all system. Maybe just writing <mpl_configdir>/stylelib and telling users how to find <mpl_configdir> would be sufficient.

[kikocorreoso]

@tacaswell @tonysyu
I had checked that on Linux at home.

Now, at work and at a windows7 box I get /.matplotlib so @tonysyu is right. It seems the only way is to use matplotlib.get_configdir().

Thanks.