v4.2.0

git-svn-id: https://plugins.svn.wordpress.org/advanced-custom-fields/trunk@752160 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removing old .js

git-svn-id: https://plugins.svn.wordpress.org/advanced-custom-fields/trunk@752161 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removing old .js

git-svn-id: https://plugins.svn.wordpress.org/advanced-custom-fields/trunk@752162 b8457f37-d9ea-0310-8a92-e5e31aec5664