add some requirements for bootstrapping a new virtualenv
remove the need for local_settings with environ

makes it faster to configure a database. dj-database-url pattern should
be familiar enough to our developers but a README update would be nice.
add section about running tests to README
fix absolute_url test broke in django 1.5

maybe it broke in 1.4, who knows. Django 1.4 added settings overrides in
tests, so use it.
refactor other test to use django's settings override too
Merge pull request #3 from texastribune/fix-test-suite

Get test suite running again