Minor acf-icon CSS improvements

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Merge branch 'master' of https://github.com/AdvancedCustomFields/acf5-beta
Fixed bug with ACF4 field group compatibility

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Adding new acf_db_version option

Signed-off-by: Elliot Condon <e@elliotcondon.com>