Version 3.2.1 - Stubber changes and fixes

Changed

• Stubber now has an option to only "export" the resulting "Final" stub
  class and keeping all the other stubs "private" and this option is True by
  default (they don't really need to be public)
• You can now give the resulting "Final" config stub a custom name
• You can also give the "Final" config stub an empty string for a name which
  will simply omit generating it (for custom/complex composition of stubs
  later on if people want)
• All stubs now also inherit from dict because any attribute in
  BaseConfig that's a Map (and thus has a stub class) will also behave as
  a dict (even if Empty)

Fixed

• Stubber now appends an underscore to stubs with Python reserved keywords
  like class and def etc.
• The BaseConfig object now also spots attribute fetching of those
  keywords with an appended underscore and fetches the correct attribute
  nevertheless.