Integrate with Mezzanine's Pages Middleware

Integration allows users to add a Page linked to the app, marking it's
navigation tabs active and generating breadcrumbs.

* Add a views module to override dpaste's snippet_new and
  snippet_details views. These new views simply use Mezzanine's
  mezzanine.utils.views.render function instead of Django's
  render_to_response function.
* Add a urls module to route mezzpaste's views, falling back to dpaste
  for all other routes.

* Modify the snippet_details.html template to only add an active
  breadcrumb for the current Snippet.
* Modify the Readme to include dpaste's installation guide and
  incorporate the urls module.

* Remove extraneous breadcrumbs from the snippet_new.html template.
Prepare for v1.1.0 Release