Load ot without script-loader

The ot library is tricky to load with Webpack, as it writes
it's functions into a global `ot` object and does not export anything.
I got it working using `exports-loader` to put the `ot` object
into a CommonJS export and then forcing Webpack to only
load using CommonJS.

Signed-off-by: David Mehren <git@herrmehren.de>

public/js/index.js

@@ -1,7 +1,7 @@
 /* eslint-env browser, jquery */
 /* eslint no-console: ["error", { allow: ["warn", "error", "debug"] }] */
 /* global Cookies, moment, serverurl,
-   key, Dropbox, ot, hex2rgb, Visibility */
+   key, Dropbox, hex2rgb, Visibility */
 
 import TurndownService from 'turndown'
 import CodeMirror from 'codemirror/lib/codemirror.js'
@@ -13,6 +13,8 @@ import Idle from 'Idle.Js'
 
 import '../vendor/jquery-textcomplete/jquery.textcomplete'
 
+import { ot } from '../vendor/ot/ot.min.js'
+
 import { saveAs } from 'file-saver'
 import randomColor from 'randomcolor'
 import store from 'store'