input-pill: Have all clicks directly on container focus input.

If a user clicks on the pill container and not directly on a pill
or on an "x" inside of a pill, it should be presumed they are
trying to input new text. This effectively makes the whole non-pill
section an input bar.

static/js/input_pill.js

@@ -254,6 +254,12 @@ var input_pill = function ($parent) {
             funcs.removePill(id);
             $next.focus();
         });
+
+        store.$parent.on("click", function (e) {
+            if ($(e.target).is(".pill-container")) {
+                $(this).find(".input").focus();
+            }
+        });
     }());
 
     // the external, user-accessible prototype.