preserve pip errors so travis reports install failures better
Fix urlconf include login_required handling

When a urlpattern matches but the view returns a 404, we shouldn't try
to redirect to login. This is done by checking if the url resolves
before and after the login_required pages are added. Only if it does not
resolve before but does after should we redirect to login.
Patch fancybox to work with jQuery 1.9

jQuery removed $.browser
Merge branch 'travis-install-failure'
Remove view_instance from WidgyViewMixin.

This was left over from how we were doing permissions for the Review
Queue before.  It is not being used anywhere now.
Use the django_polymorphic from PyPI.

The 0.5.1 version has been released for a while now, there is no reason
to use the development version anymore.
Specify minimum versions of dependencies.

Instead of pinning exact versions.  Several of our dependencies have
already had several updates and we shouldn't force our users to use old
versions of those packages.
sprites
Use a ::before pseudo-element for icons in shelf.

The ::before pseudo-element gives us more control over the exact output
dimensions and positioning of the icon.
Remove unused and duplicate widget icons.
html.admin.scss was missing widgy_common.
Use widgy_common.scss in django.fusionbox.scss
Merge pull request #230 from fusionbox/fix_scss_errors

Fix scss errors
need to ignore demo/static too
Merge pull request #227 from fusionbox/sprites4

Sprites for widget icons
Give restoring pages a slug

Recent Mezzanine's page context processor requires something non-null
Don't depend on polymorphic any more

Only django-filer needs it, and it already has it as a dependency
Only show interesting approve/unapprove buttons

For old commits, approving or unapproving them won't actually do
anything. Once we get to the first approved commits, we can stop showing
the approve/unapprove buttons.
use unicode format strings
Merge pull request #226 from fusionbox/update_filer_dep

Only pin minimum versions of our dependencies