Backport bootstrap-typeahead click fix to make clicking on autocomplete more reliable

This is the patch described here:

https://github.com/twitter/bootstrap/issues/2715
92189b87ad

That commit has not been upstreamed to bootstrap due to bureaucracy issues.

(imported from commit 3c4a109b58f403569a41f5048ab347a800f029c2)

zephyr/static/third/bootstrap/js/bootstrap.js

@@ -2028,7 +2028,11 @@
 
   , blur: function (e) {
       var that = this
-      setTimeout(function () { that.hide() }, 150)
+      setTimeout(function () {
+        if (!that.$menu.is(':hover')) {
+          that.hide();
+        }
+      }, 150)
     }
 
   , click: function (e) {