fixed #44 because pyramid 1.5 now requires config.include('pyramid_chameleon') when

[GabLeRoux]

using pt files

[mmerickel]

it appears to me as if the include needs to occur in the unit tests as well, at least in step 07, due to the use of get_renderer() in the WikiViews.__init__.

Specifically here https://github.com/Pylons/pyramid_tutorials/blob/master/getting_started/07-viewclasses/tutorial/tests.py#L8 and possibly elsewhere.

[tseaver]

Thanks!