syntactic sugar for get_page_modes: change it to a property called preview_modes and add a default_preview_mode helper
fix styling of preview button on create page when there are multiple preview modes
Merge branch 'feature/fep' of github.com:torchbox/wagtail into feature/fep
Merge branch 'master' into feature/fep
rename display_modes to preview_modes for consistency
rename show_as_mode to serve_preview, so that it can be mentioned in contexts that would otherwise cause people to ask 'what's a mode?'
Fix preview views to call page.serve_preview, rather than page.serve which might expect additional required args. This means we also need to fiddle the signature of serve_preview to pass it a request object, so that preview_for_moderation can pass on request.user and request.revision_id to ensure that the wagtail user bar gets displayed