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Add `times` constraint (#174)

In this commit the constraint that expect a mock to be invoked a specific number of times is added.

The implementation piggyback on the `time_to_live` of a recorder expectation to ensure it gets cleaned correctly when it is no longer expected.

To ensure a better error message a variable to store the number of times a specific mock was called was added to the structure `RecordedExpectation`.

The syntax that I selected for this was 
```
expect(function_name, times(3));
```

It looks more clean and also reads better, at least in my opinion.

Fixes issue #70

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