Pin jQuery to 1.11.1

Avoids ember-cli/ember-cli#5316 - there's more details
[here](ember-cli/ember-cli#5316) and a good
description
[here](http://benlimmer.com/2016/01/08/ember-jquery-dependancies/):

> Just recently, jQuery 1.12.x was released to bower, and Ember-CLI’s
default blueprint allowed upgrading to this version. Unfortunately, all
current versions of Ember have a hardcoded check that will make you
have a bad time.

It was fixed in ember by
emberjs/ember.js#12793.

bower.json

@@ -8,7 +8,7 @@
     "ember-qunit": "0.4.1",
     "ember-qunit-notifications": "0.0.7",
     "ember-resolver": "~0.1.18",
-    "jquery": "^1.11.1",
+    "jquery": "1.11.1",
     "loader.js": "ember-cli/loader.js#3.2.0",
     "qunit": "~1.17.1"
   }