make seq tooltips appear on focus

remove focus from tab when clicked

common/lib/xmodule/xmodule/css/sequence/display.scss

@@ -111,7 +111,7 @@ nav.sequence-nav {
           outline: 0;
         }
 
-        &:hover {
+        &:hover, &:focus {
           background-color: #fff;
           background-repeat: no-repeat;
           background-position: center 14px;
@@ -235,7 +235,7 @@ nav.sequence-nav {
           }
         }
 
-        &:hover {
+        &:hover, &:focus {
           p {
             display: block;
             margin-top: 4px;

common/lib/xmodule/xmodule/js/src/sequence/display.coffee

@@ -103,6 +103,7 @@ class @Sequence
 
       sequence_links = @$('#seq_content a.seqnav')
       sequence_links.click @goto
+    @$("a.active").blur()
 
   goto: (event) =>
     event.preventDefault()