Gravity Forms Agile CRM Addon 1.6.0

- Added tooltip to the Tags setting on the feed configuration page.
- Updated feed processing error logging statement and entry note to use the API returned error message when a 400 error occurs.
- Fixed the width of the Feed Name setting on the feed configuration page.

- Added security enhancements.
- Added GPL to plugin header.
- Updated Plugin URI and Author URI to use https.
- Updated analytics tracking code.
- Fixed strings for translations.

- Added security enhancements.