* Template._render_partial() now passes self.view.template_extension to
   Loader.load_template().

 * The test case test_examples.test_template_partial_extension now passes.

 * Corrected the expectation of the test case test_simple.test_template_partial_extension.
   It passes under the change to Template._render_partial().

 * Removed trailing white space in test_simple.py.