Fix unit test initialisation issue for test_wikicorpus.py, fix#956

[markroxor]

Initialising unittest for TestWikiCorpus ,fix #956

[markroxor]

Both(python 2.7.9 and python 3.4.2) builds pass on my VM and my Travis.

[tmylk]

2.7 test still hangs in the same way. Are you sure that this is the solution?

[markroxor]

It works fine on my VM and Travis. I can't imitate the error.

[tmylk]

did it work fine before this change too?

[markroxor]

It worked fine but did not throw any message (whether the test was ok or not)

[tmylk]

how did you run it? so what is the reason for this change?

[markroxor]

I followed .travis.yml on my VM.
All the other test_xx.py files include
if __name__ == '__main__':
logging.basicConfig(format='%(asctime)s : %(levelname)s : %(message)s', level=logging.DEBUG)
unittest.main()
so that the testxxx methods are invoked. Also according to the documentation.

[tmylk]

Sure, thanks for the PR