Added new default CSS to handle recent additions to Google Forms.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@796076 b8457f37-d9ea-0310-8a92-e5e31aec5664
Prep for v0.59 release.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@796077 b8457f37-d9ea-0310-8a92-e5e31aec5664