Fix bug when raising uncaught exception & Add exception test cases

* Most C++ exceptions appear in Python as a RuntimeError.
  This bug is fixed by registering additional exception translators.
* However, there are 5 Exceptions can not be registered:
  EnvironmentError, IOError and OSError (as ENVIRONMENTERROR_EXCEPTION)
  WindowsError, VMSError (not being used)
* Changed run_test for comparing the exception type raised in python
  and the type raised in pythran.