Merge pull request #1 from torchbox/master

merge upstream
adding custom img attrs to image_tags, but no custom TestCasecreated for it
typo
Addition of attrs property to image template tag
send init_new_page signal when creating a new page in the admin
Merge branch 'master' of https://github.com/torchbox/wagtail
add next and previous published siblings to Page model
Added wagtail and django settings doc

more settings stuffs

settings stuff

settings stuff

so many things

omg is it really two AM

More docs
made published siblings a single query
Settings doc changes based on feedback
fix kwarg spacing
Merge branch 'master' of https://github.com/torchbox/wagtail into feature/init_new_page__signal
only send signal outside if not POSTing new page
Fixes to wagtailadmin page index view
Improvements to wagtailadmin explorer tests
Improvements to existing slug unit tests for create and edit views
Removed assertURLEqual, replaced with Djangos built in assertRedirects
get_page_types no longer required in wagtailadmin.views.pages
Check that the content type passed to wagtailadmin.pages.create is valid according to subpage_types
Make can_add_subpage and can_publish_subpage permission checks return False for page models that disallow subpages; this ensures that 'add child page' links are not shown