Improves interface for Fuck::Thing

  Now requires arguments :thing and :from
Choose not to subclass PayDirt::Base

  - Rather include PayDirt::UseCase
Bumps version for 0.1.0 release

  - Minor version release due to a change in the API for
    Fuck::Thing
  - Fuck::Thing#initialize will now fail to initialize if :thing is not supplied in
    the options hash.
Update README to hilight use of #call