Added Jumplead to admin menu. Created Jumplead landing page and settings page. Added menu icon

git-svn-id: https://plugins.svn.wordpress.org/jumplead/trunk@976487 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tagged 2.8

git-svn-id: https://plugins.svn.wordpress.org/jumplead/trunk@976488 b8457f37-d9ea-0310-8a92-e5e31aec5664