bower.json: Update jQuery version range to exclude v3 (#1043)

Also makes the range match that of upstream Less-based Bootstrap.
Fixes #1042

bower.json

@@ -30,7 +30,7 @@
     "Gemfile"
   ],
   "dependencies": {
-    "jquery": ">= 1.9.0"
+    "jquery": "1.9.1 - 2"
   },
   "version": "3.3.6"
 }