cache requests 

git-svn-id: https://plugins.svn.wordpress.org/jm-simple-qr-code-widget/trunk@901106 b8457f37-d9ea-0310-8a92-e5e31aec5664
forgetvar dump in code -_-'

git-svn-id: https://plugins.svn.wordpress.org/jm-simple-qr-code-widget/trunk@901107 b8457f37-d9ea-0310-8a92-e5e31aec5664