Lizard-ui

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- Added optional sentry setup.

- Re-did login view as a class based view.

- Fixed the problem that the print of the web page showed a progress icon
instead of a graphs (ticket 3180).

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- Added short_timedelta template filter.

- Added ViewContextMixin mixin class for class based views that adds {'view':
self} to your view's context dict. This should be all you need to have in
your context.

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- Fixed debugmode_urlpatterns checker.

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- Adding checker that warns if the debugmode_urlpatterns isn't being imported.

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- TracebackLoggingMiddleware isn't needed anymore, so the config checker now
tells you that if you still have it in your MIDDLEWARE_CLASSES.

- Switched off sql statement logging by default.

- Added url patterns for showing static/ and media/ files in debug mode. Use
it by importing ``debugmode_urlpatterns`` from ``lizard_ui.urls`` and
calling ``urlpatterns += debugmode_urlpatterns()``.

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- Added javascript-based csrf-for-ajax fix suggested in
https://docs.djangoproject.com/en/1.3/ref/contrib/csrf/#ajax

- Adjusted for Django 1.3. Note that this is now also a dependency! Upgrading
will be slightly harder. Run ``bin/django check_config`` to check your
config afterwards. See the README for more how-to-change information.