Log Message:
Update ruby-flexmock to 2.2.1.

2.2.0:

 - #new_instances now mocks the #initialize method instead of mocking after the
   allocation was done. This allows to do mock methods called by #initialize
   itself. Behaviour when the allocator is explicitely provided is left
   unchanged, which means that the old behaviour is still available by passing
   :new to new_instances.

2.1.0:

 - added `#and_iterates` to fix some shortcomings of `#and_yield` without
   breaking backward compatibility
 - strict partial mocks (and "based mocks" if \ 
`FlexMock.partials_are_based` is
   set to true) are now based on the object's singleton class, instead of its
   class.