wp_head is not early enough

We need to use a custom action that can be placed immediately below `<meta charset="utf-8" />`

Also, moving the admin script up to `admin_enqueue_scripts` as that occurs sooner than `admin_print_scripts`
Merge pull request #24 from zbtirrell/even-earlier

wp_head is not early enough
Merge branch 'master' of github.com:GigaOM/go-newrelic into wpcli