Added USE_FOLDER_AS_CATEGORY setting.

This allows users to organize their files in ways where the subfolder name
would not make a good category name (i.e. /2012/09/). Set this to ``False``
and the subfolder will no longer be used as a standard category,
`DEFAULT_CATEGORY` will be used instead.

pelican/contents.py

@@ -121,7 +121,8 @@ class Page(object):
             'lang': getattr(self, 'lang', 'en'),
             'date': getattr(self, 'date', datetime.now()),
             'author': self.author,
-            'category': getattr(self, 'category', 'misc'),
+            'category': getattr(self, 'category',
+                self.settings['DEFAULT_CATEGORY']),
         }
 
     def _expand_settings(self, key):