Updated options page to include better notice for ad setup mode. Also added coupon for GARD Pro.

git-svn-id: https://plugins.svn.wordpress.org/google-adsense-for-responsive-design-gard/trunk@803208 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added update notes to readme.txt

git-svn-id: https://plugins.svn.wordpress.org/google-adsense-for-responsive-design-gard/trunk@803209 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added 300x600 ad size

git-svn-id: https://plugins.svn.wordpress.org/google-adsense-for-responsive-design-gard/trunk@804090 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated link for gard pro to add trailing slash

git-svn-id: https://plugins.svn.wordpress.org/google-adsense-for-responsive-design-gard/trunk@804091 b8457f37-d9ea-0310-8a92-e5e31aec5664