Issue #28 and #21 mock method arguments

[crookse]

Fixes #28 and #21.

Description

• adds mock.methods.{someMethod}.wasLastCalledWith([arg1, arg2, etc.])
• adds mock.methods.{someMethod}.wasCalledTimes(numberOfTimes)
• adds mock.methods.{someMethod}.lastReturned(returnValue)
• removes mock.calls.{someMethod}

See the test file for examples of how they work.

[ebebbington]

this PR ready for review?

[crookse]

this PR ready for review?

yesSirz