Add support for "new-style grids" and "model master views".

Finally, an API that makes some sense...  We don't yet have feature parity
with the old-style grids and CRUD views, but this is already a significant
improvement to the design.  Still needs a lot of docs though...

tailbone/templates/master/view.mako

@@ -0,0 +1,19 @@
+## -*- coding: utf-8 -*-
+<%inherit file="/base.mako" />
+
+<%def name="title()">${model_title}: ${unicode(instance)}</%def>
+
+<%def name="context_menu_items()">
+  <li>${h.link_to("Back to {0}".format(model_title_plural), url(route_prefix))}</li>
+  % if request.has_perm('{0}.edit'.format(permission_prefix)):
+      <li>${h.link_to("Edit this {0}".format(model_title), action_url('edit', instance))}</li>
+  % endif
+</%def>
+
+<ul id="context-menu">
+  ${self.context_menu_items()}
+</ul>
+
+<div class="form-wrapper">
+  ${form.render()|n}
+</div><!-- form-wrapper -->