Allow inheriting mocks matchers

Created by: nepalez

With reference to #1055 (closed)

Allows rspec matchers inherited from RSpec::Mocks::Matchers::* to be used both in mocks and expectations:

  class ReceiveFoo < RSpec::Mocks::Matchers::Receive
    def initialize
      super :foo, nil
    end
  end

  describe "receiving foo" do
    it "works" do
      object = double

      allow(object).to receive_foo
      expect(object).to receive_foo

      object.foo
    end
  end