browser: do not reference bower "bootstrap-sass"

... such a bower component does not exist!

Author: laurelnaiad

browser/bower.json

@@ -39,7 +39,6 @@
     "mocha": "2.0.1",
     "sinon-browser-only": "1.12.1",
     "sinon-chai": "2.6.0",
-    "bootstrap-sass": "3.0.2",
     "moment": "2.8.4"
   },
   "overrides": {