Use urlify.js for slugs

Modified _editor_js.html to include the
django-admin/js/urlify.js in the list of
static javascript includes and changed
page-editor.js to use the URLify function.
Fixed typo on list documents template
Logout now redirects to login view instead of a harcoded url.
Changes for password reset form

Fixed the styling of the "Enter your email..." message.
When email was empty a 500 error was thrown - added check
and exception for that case.
Merge pull request #9 from spapas/master

Use urlify.js for slugs and fix type on list documents template