Added locked boolean to Page
Don't allow any admin actions to be performed on a locked page
Added views for locking and unlocking pages
Fixed Python 3.2 incompatible migration
Fixed some issues found while writing tests
Added tests for page locking views
Merge branch 'master' into pull_576
styling of edit lock
styling for users without lock perms
duplicate label
updated to add better eye icons
replaced eye icon and updated usage of the icon in UI
tweaks to icon sizes
updated font again
font size tweaks
alignment tweak
Added cloudflare cache invalidation
Improved multi backend support in wagtailfrontendcache
Merge remote-tracking branch 'torchbox/master' into page-locking-2
Fixed migration conflicts