Fix assertRaises when the exception has a metaclass
Due to not taking into account that the type of the class can be a
subclass of type (which is the case when using metaclasses),
assertRaises would report a false positive in case an exception that was
expected had a custom metaclass.
This patch introduces a more robust checking if a given object is a
class or an instance of one, and adds a test case, to make sure
exceptions with custom metaclasses don't break assertRaises.
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Mar 26, 2013