Fix staticfiles panel to work with prefixed STATICFILES_DIRS.

Closes #503 and #507. Many thanks to Alexander Clausen (@sk1p) for the
inspiration for the patch.
Updated Travis config to Django 1.6.1.
Implicit setup can also fail with ImproperlyConfigured.

Fix #511.
Fix: query.engine can be 'MySQLdb' for msyql.

query.engine could be 'mysql' or 'MySQLdb' for mysql driver.
Fix: sql panel sql uncollapse

sql_select.html, sql_explain.html, sql_profile.html
These three templates all need toolbar.sql.js, otherwise
the `select ...` cannot be uncollapsed.
Merge pull request #512 from ifduyue/fix-sql-panel-toggle

Fix: sql panel sql uncollapse
Use ugettext_lazy for import-time translations.

Thanks Anssi for the report.
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.
Remove dependency on jquery-cookie plugin

Replace plugin with simpler get and set methods.
Merge pull request #530 from djfarrelly/master

Remove dependency on jquery-cookie plugin
Merge pull request #513 from ifduyue/fix-ifequal-mysql-engine

Fix: query.engine can be 'MySQLdb' for msyql.
Take advantage of default_app_config.

This is really going to help reduce complaints, given that we don't have
a good place to put upgrade instructions.
Account for the signal changes in Django 1.7.