Bump trunk version to 2.7.8

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@744420 b8457f37-d9ea-0310-8a92-e5e31aec5664
Force verification to always be displayed

git-svn-id: https://plugins.svn.wordpress.org/visual-form-builder/trunk@744421 b8457f37-d9ea-0310-8a92-e5e31aec5664