Pass base_url to user and badge views.
Shorten/simplify displayed page titles.
Use BeforeRender and Pyramid events to make base_url and title global vars.

-   For issue #61
Add a comment about the authentication secret.
Consolidate a auth-policy-setting into the Configurator constructor.
Merge branch 'feature/issue-61' into feature/issue-33

Conflicts:
	tahrir/views.py
I have groked Pyramid auth. Removal of is_admin closes #33.
Merge branch 'feature/issue-33' into develop