Gomega matchers that integrate with hel mocks.

hel uses channels to store the history of a method. This allows tests to assert that the file was called any number of times in a go-routine safe way.

While Gomega has matchers for channels (e.g. Receive), they don't lend themselves to asserting for multiple values. eachers is intended to fill that void.

###EqualEach###

Expect(helChannel).To(EqualEach(1,2,3))

###BeEquivalentToEach###

Expect(helChannel).To(BeEquivalentToEach(1,2,3))

###Each###

Expect(helChannel).To(Each(BeEquivalentTo,1,2,3))

Note: Each is actually used by both EqualEach and BeEquivalentToEach.