Updating config.py so that the paths are customizable without overiding any methods on AppConfig.
Updating config.py so that the paths are customizable without overiding any methods on AppConfig.

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extra : convert_revision : svn%3A77541ad4-5f01-0410-9ede-a1b63cd9a898/trunk%405119

lucius-feng/tg2,lucius-feng/tg2