Default DEBUG_TOOLBAR_PANELS didn't match the docs.

Fix #519.
Pull translations from Transifex.
Bump version number for bugfix releases.
Move settings patching code to the settings module.
Add an AppConfig for Django 1.7.
Update version panel for Django 1.7.
Test properly for django.contrib.staticfiles on Django 1.7.

The test in the staticfiles panel was redundant since the debug toolbar
now requires staticfiles.
Allow the tests to run on Django 1.7.