Chai

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Allow variables in returns(), effectively treating the variable as a regex capture.

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Merge pull request to close issue 2

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side_effect is passed the arguments of the expectation if it doesn't define
its own arguments

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side_effect takes arguments after the method to eliminate need for a lambda

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Fixed a bug with (un)stubbing of a module attribute which is really a classmethod

Added support for `with` statement on expectations, see README for usage

Fixed (un)stubbing of methods originally defined on `object` class

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Added __eq__ to all comparators so that they can be used inside data structures.