Updating to version 2.5. See changelog for details.

git-svn-id: https://plugins.svn.wordpress.org/ninja-forms/trunk@856016 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating to version 2.5.1. See changelog for details.

git-svn-id: https://plugins.svn.wordpress.org/ninja-forms/trunk@857329 b8457f37-d9ea-0310-8a92-e5e31aec5664