Fixes the bootstrap version to 3.1.1, because using the current (3.3.5)

causes UI problems (tooltips not dissapearing).

package.json

   "dependencies": {
     "async": "0.9.0",
     "autosize": "^1.18.13",
-    "bootstrap": "^3.1.1",
+    "bootstrap": "3.1.1",
     "events": "*",
     "i18next-client": "1.7.7",
     "jquery": "^2.1.1",