Fixed get_fields bug

https://github.com/AdvancedCustomFields/acf5-beta/issues/274
Signed-off-by: Elliot Condon <e@elliotcondon.com>
Fixed incorrect value type returned for page_link

https://github.com/AdvancedCustomFields/acf5-beta/issues/281
Signed-off-by: Elliot Condon <e@elliotcondon.com>