Configuration object for Roller. Reads and writes roller-config.xml.
RollerConfig extends Struts ActionForm so that it can be extended by
RollerConfigForm in the administrator pages.
This is where you set default Roller configuration values.
Directory where uploaded files will be stored.
May end with a slash. Optional, this value will
default to RollerContext.USER_RESOURCES. If specified,
should be a full path on the system harddrive or
relative to the WebApp.