Prep for v0.60 release.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@807399 b8457f37-d9ea-0310-8a92-e5e31aec5664
Prep for v0.60 release.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@807400 b8457f37-d9ea-0310-8a92-e5e31aec5664