Contexts still can't see outer scope. Add failing test.

examples/nested_context.mustache

-{{#foo}}{{thing1}} and {{thing2}}{{/foo}}{{^foo}}Not foo!{{/foo}}
\ No newline at end of file
+{{#foo}}{{thing1}} and {{thing2}} and {{outer_thing}}{{/foo}}{{^foo}}Not foo!{{/foo}}

examples/nested_context.py

@@ -3,5 +3,8 @@ import pystache
 class NestedContext(pystache.View):
     template_path = 'examples'
 
+    def outer_thing(self):
+        return "two"
+
     def foo(self):
         return {'thing1': 'one', 'thing2': 'foo'}

tests/test_examples.py

@@ -69,7 +69,7 @@ Again, Welcome!
 """)
 
     def test_nested_context(self):
-        self.assertEquals(NestedContext().render(), "one and foo")
+        self.assertEquals(NestedContext().render(), "one and foo and two")
 
 if __name__ == '__main__':
     unittest.main()