Create directory specified by MPLCONFIGDIR if it does not exist.

svn path=/trunk/matplotlib/; revision=8609

Author: astraw

CHANGELOG

@@ -1,3 +1,6 @@
+2010-08-01 Create directory specified by MPLCONFIGDIR if it does
+           not exist. - ADS
+
 2010-07-20 Return Qt4's default cursor when leaving the canvas - DSD
 
 2010-07-06 Tagging for mpl 1.0 at r8502

lib/matplotlib/__init__.py

@@ -456,6 +456,8 @@ def _get_configdir():
 
     configdir = os.environ.get('MPLCONFIGDIR')
     if configdir is not None:
+        if not os.path.exists(configdir):
+            os.makedirs(configdir)
         if not _is_writable_dir(configdir):
             raise RuntimeError('Could not write to MPLCONFIGDIR="%s"'%configdir)
         return configdir