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/settings.py

@@ -34,6 +34,7 @@ _DEFAULT_CONFIG = {'PATH': '.',
                    'PDF_GENERATOR': False,
                    'OUTPUT_SOURCES': False,
                    'OUTPUT_SOURCES_EXTENSION': '.text',
+                   'USE_FOLDER_AS_CATEGORY': True,
                    'DEFAULT_CATEGORY': 'misc',
                    'DEFAULT_DATE': 'fs',
                    'WITH_FUTURE_DATES': True,