Preparing for 1.4 release.

git-svn-id: https://plugins.svn.wordpress.org/instant-breadcrumbs/trunk@882047 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated stable tag to 1.4.

git-svn-id: https://plugins.svn.wordpress.org/instant-breadcrumbs/trunk@882049 b8457f37-d9ea-0310-8a92-e5e31aec5664