Refactoring Mocks::Proxy to make it easier to treat blocks similarly to args for expectations matchers like a_block

[kaiwren]

Ref the conversation #1237 (comment)

Redid the a_block change after refactoring Mocks::Proxy to make it easier to treat blocks similarly to args for expectations matchers like a_block - this PR includes all the commits originally made in #1237

  # Matches if a block is passed implicitly i.e is invoked
  # using `yield` in the receiving method
  #
  # @example
  #   expect(object).to receive(:message).with(a_block)
  #
  #   # matches any of these:
  #   object.message { }
  #   empty_lambda = lambda { }
  #   object.message(&empty_lambda)
  #   empty_proc = Proc.new { }
  #   object.message(&empty_proc)

[mikegee]

"invocation"

[kaiwren]

Thanks, fixed in 9bc5f79

[kaiwren]

OK I have this green for all rubies except for 1.8.7, ree and jruby 1.7 (all three with the same red spec). I'm having trouble installing 1.8.7/ree on my box, will try with jruby 1.7.