Gocept.collmex

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- Added methods to Activity to parse/calculate the dates, times, breaks,
duration.

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- Improve check for invalid credentials when ``gocept.collmex.collmex.Collmex``
is created.

- Yield more detailed information when parsing of the ini file failed.

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- Fix the check for invalid credentials when ``gocept.collmex.collmex.Collmex``
is created.

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- Credentials to log into Collmex can be given via an `collmex.ini` file.

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- Creation of test activities is now fully customizable

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- gocept.collmex is now compatible with Python 3.2 and Python 3.3!