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http://open.silverstripe.org/ticket/7214
Added watermark to show current state of preview.
Removed button styling from Draft and Preview and added styling to show current selected state.
Designs signed off by Paul
Conflicts:
admin/css/screen.css
ENHANCEMENT New "preview" and "edit" buttons to toggle between preview and cms views. Reinstated utility links to switch between draft and live preview (based on SilverStripeNavigator) (formerly called "AjaxSwitchView")