Removed redundant 'in development' notice
consistent editors / editor's / Editor's
Set owner of copied pages to the user who copied them
Alter wagtailadmin.utils.used_by()

wagtailadmin.utils.used_by() no longer assumes that model
relationships to pages are named 'page'. Instead it assumes that all
ParentalKey relationships are relationships to pages.
Added option to copy form to publish copied pages. This is not displayed to users without publish permissions.
Merge remote-tracking branch 'torchbox/master' into page-copy-ui

Conflicts:
	wagtail/wagtailadmin/forms.py
Rerun makemessages on wagtailadmin
Rerun makemessages on wagtailcore
Rerun makemessages on wagtaildocs
Rerun makemessages on wagtailembeds
Run makemessages on wagtailforms
More granular group view permissions checks
Implement group delete functionality
Rerun makemessages on wagtailredirects
Templates folder structure tidy
Rerun makemessages on wagtailusers
Rerun makemessages on wagtailimages
Rerun makemessages on wagtailsearch
Rerun makemessages on wagtailsnippets
Run makemessages on wagtailstyleguide