Cleaved Badger::Config get() method in twain to provide a separate dot() method.  Added memory_cache
Added Badger::Workspace
Fixed up minor Hub/Config bug when using subclassed config modules
Changed Badger::Config::Directory to use generic cache module
Fixed dump_ref() function in Badger::Debug
Added Badger::Filter, Badger::Cache and Badger::Workspace.  Added parent inheritance to B::Config::Directory