css: add button css

plugin: load the button css

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848772 b8457f37-d9ea-0310-8a92-e5e31aec5664
search: optimize html

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848773 b8457f37-d9ea-0310-8a92-e5e31aec5664
dashboard: rename search query name

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848774 b8457f37-d9ea-0310-8a92-e5e31aec5664