plugin: replase loading css hook from admin_head-index.php to admin_enqueue_scripts

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848961 b8457f37-d9ea-0310-8a92-e5e31aec5664
load History class bug fix (maybe

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848962 b8457f37-d9ea-0310-8a92-e5e31aec5664
0.3.6 bump

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848963 b8457f37-d9ea-0310-8a92-e5e31aec5664