Refactor test_integration to use a fixture

* Create an instance of IntegrationTestCase and pass it into each test
* Use my_view function from tests.views instead of view
Add test for BaseIntegrationTestCase.render_to_str

* Fix conversion of rendered content bytes to str
* Add template_view_integration fixture
* Add MyTemplateView and page.html template
Add test for access_view_and_render_response
Work around python2 TestCase limitation

* Provide required methodName to TestCase.__init__
Update page.html with non-ascii characters

* Check render_to_str handles utf-8 content correctly on python 2 and 3
Merge pull request #29 from incuna/test-render

Add tests for untested code