Gravity Perks - Reload Form 2.1.9

Fixed an issue where AJAX spinner didn't show in GF 2.5.

Updated priority of init script registration to allow other plugins to modify the form before Reload Form registers its scripts.
Added gprf_replacing_elem filter to allow modifying which element is replaced with the original form markup when the form is reloaded.

Added support for Gravity Forms 2.5 (#6)
Improved compatibility with dynamic forms by returning freshly generated form markup when the form is submitted.
Added 'gprf_disable_dynamic_reload' filter to disable dynamic reload of form markup and rely on the form markup on the initial page load.
Updated Perk to use GP_Plugin class provided by Gravity Perks 2.0.
Fixed an issue where a page with multiple forms that use GPRF may not function correctly.
Fixed incorrect $_path which causes a myriad of issues with perk-specific functionality.