New functionality: detects mobile browsers and automatically enables responsive version of form.

git-svn-id: https://plugins.svn.wordpress.org/rackforms-express/trunk@891455 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated version number.

git-svn-id: https://plugins.svn.wordpress.org/rackforms-express/trunk@891456 b8457f37-d9ea-0310-8a92-e5e31aec5664