Fix RegionMappingImporterTest on Windows

Stacktrace

Project should contain only one data type:RegionMapping Expected 1 but got 2.
  File "C:\Anaconda\envs\tvb-run\lib\unittest\case.py", line 331, in run
    testMethod()
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\core\base_testcase.py", line 252, in dec
    result = func(*args, **kwargs)
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\adapters\uploaders\region_mapping_importer_test.py", line 167, in test_import_from_bz2
    self._import_from_file(self.BZ2_FILE)
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\adapters\uploaders\region_mapping_importer_test.py", line 174, in _import_from_file
    region_mapping = self._import(import_file, self.surface.gid, self.connectivity.gid)
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\adapters\uploaders\region_mapping_importer_test.py", line 125, in _import
    region_mapping = self._get_entity(RegionMapping(), data_filter)
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\adapters\uploaders\region_mapping_importer_test.py", line 96, in _get_entity
    self.assertEqual(1, len(data_types), "Project should contain only one data type:" + str(expected_data.type))
  File "c:\hudson\workspace\tvb - build - windows\framework_tvb\tvb\tests\framework\core\base_testcase.py", line 91, in assertEqual
    message + " Expected %s but got %s." % (expected, actual))
  File "C:\Anaconda\envs\tvb-run\lib\unittest\case.py", line 515, in assertEqual
    assertion_func(first, second, msg=msg)
  File "C:\Anaconda\envs\tvb-run\lib\unittest\case.py", line 508, in _baseAssertEqual
    raise self.failureException(msg)