Fix doc building with version from versioneer.

Author: abergeron

doc/conf.py

@@ -57,10 +57,17 @@
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
+
+# We need this hokey-pokey because versioneer needs the current
+# directory to be the root of the project to work.
+_curpath = os.getcwd()
+os.chdir(os.path.dirname(os.path.dirname(__file__)))
 # The full version, including alpha/beta/rc tags.
 release = versioneer.get_version()
 # The short X.Y version.
 version = '.'.join(release.split('.')[:2])
+os.chdir(_curpath)
+del _curpath
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.