Make compatible with unittest.TestProgram in python3

[ikedam]

Replaces #140.

XMLTestRunner doesn't receive options like -b via unittest.TestProgram in python3.
This is caused for this implementation in unittest in python3: https://github.com/python/cpython/blob/v3.4.8/Lib/unittest/main.py#L234
XMLTestRunner.__init__ should be compatible with TestTestRunner.__init__.

• Add tests to demonstrate the issue. This will verify that the issue is fixed with this request
• Fix the issue

[coveralls]

Coverage decreased (-2.7%) to 96.772% when pulling 5e7f663 on ikedam:feature/compatibleWithTestProgram into a285464 on xmlrunner:master.

[coveralls]

Coverage decreased (-2.7%) to 96.772% when pulling 5e7f663 on ikedam:feature/compatibleWithTestProgram into a285464 on xmlrunner:master.

[coveralls]

Coverage increased (+0.009%) to 99.462% when pulling 04aa9f8 on ikedam:feature/compatibleWithTestProgram into a285464 on xmlrunner:master.

[ikedam]

test_test_program_fail_with_buffer and test_test_program_succeed_with_buffer failed in python3.3 and python3.4 as reported by TravisCI.
https://travis-ci.org/xmlrunner/unittest-xml-reporting/jobs/379441499
https://travis-ci.org/xmlrunner/unittest-xml-reporting/jobs/379441500

======================================================================
FAIL: test_test_program_fail_with_buffer (tests.testsuite.XMLTestRunnerTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/xmlrunner/unittest-xml-reporting/tests/testsuite.py", line 636, in test_test_program_fail_with_buffer
    self.assertNotIn('should be printed', r[0].getvalue())
AssertionError: 'should be printed' unexpectedly found in 'should be printed\n'
======================================================================
FAIL: test_test_program_succeed_with_buffer (tests.testsuite.XMLTestRunnerTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/xmlrunner/unittest-xml-reporting/tests/testsuite.py", line 607, in test_test_program_succeed_with_buffer
    self.assertNotIn('should not be printed', r[0].getvalue())
AssertionError: 'should not be printed' unexpectedly found in 'should not be printed\n'

This meant -b option didn't work in python3.
I'll push a commit to fix the issue.

[codecov-io]

Codecov Report

Merging #167 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
+ Coverage   99.45%   99.46%   +<.01%     
==========================================
  Files          17       17              
  Lines        1278     1300      +22     
==========================================
+ Hits         1271     1293      +22     
  Misses          7        7

Impacted Files	Coverage Δ
xmlrunner/runner.py	100% <100%> (ø)	⬆️
tests/testsuite.py	100% <100%> (ø)	⬆️

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[ikedam]

The issue is caused for that XMLTestRunner doesn't support warnings parameter that is added to TextTestRunner in python3: https://github.com/python/cpython/blob/v3.4.8/Lib/unittest/runner.py#L129

This change receives any unknown parameters and pass them through to TextTestRunner.
This ensures XMLTestRunner.__init__ is always compatible with TextTestRunner.__init__ and clarifies that XMLTestRunner itself doesn't handle those parameters.