Use context manager for assertRaises (#537)
* Use context manager for assertRaises, fixes #536. * Update usage of unittest to unittest2. * Remove unneeded `if __name__ == '__main__':` clauses in test files.
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* Use context manager for assertRaises, fixes #536. * Update usage of unittest to unittest2. * Remove unneeded `if __name__ == '__main__':` clauses in test files.