Receive matcher now stubs its expected message, as in RSpec.

It does not override an existing stub, if you have manually stubbed the message before.
Merge pull request #223 from stepanhruda/receive-stubbing

Receive matcher now stubs its expected message, as in RSpec.
Compile issue with pull request 223
Merge pull request #230 from timle8n1/master

Fix compile issues in pull request 223
Added support for partial mocks