Gravity Perks - Limit Submissions 1.1.21

Updated minimum Gravity Perks version to 2.2.3.
Improved styling of Time Period settings when using Gravity Forms 2.5.
Updated rule add/remove buttons in feed settings to use Gravity Forms 2.5 styling.

Fixed issue where embed URL rule would prevent submissions on all URLs after submission.

Fixed extraneous space in time units dropdown on the "minute(s)" option.
Improved reliability with Embed URL rules by ignoring trailing slashes.
Added support for the new "Quarter" calendar period.