Fix incorrect image links
Merge pull request #14 from naomicbush/issue/fix-README-images

Fix incorrect image links in README
Admin nag if Pods and/or Gravity Forms isn't activated, instead of running plugin.
Revert "Admin nag if Pods and/or Gravity Forms isn't activated, instead of running plugin."

This reverts commit a965f396f82feb665f66158f410769c3d11fc07e.
Better checks to ensure no errors if Pods or GF isn't activated + admin nag.
Hook requiring includes/Pods_GF_Addon.php to plugins_loaded
Add step 5 to instructions.