global: InvenioTestCase in test suite

* Introduces InvenioTestCase class that is to be used in all test
  suits instead of standard unittest.TestCase class.  Facilitates
  later merging to next.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
BibAutority: fix for unit test suite

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
WebSubmit: source file mode fix

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
BibAuthority: source file mode fix

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>