Gravity Perks - Live Preview 1.6.13

Fixed a potential compatibility issue with GF 2.5 and entry list pages.

Improved support for Gravity Forms 2.5. (#9)

- Added full support for Gravity Forms with improved UI.
- Updated CSS for hidden fields in Gravity Forms 2.5
- Fixed issue where admin script was not output when No Conflict Mode was enabled.
- Fixed issue where tooltips displayed underneath the form editor toolbar. Fixes #5.
- Removed tags in selectors.