Common reorg (#8025)

* Re-organize common folder

* fix: Correct paths in tests

* fix: move new content to proper folder

* chore: Move audio folder to assets

* Move sprites to sprites assets directory

* Move css sprites to assets directory

* Split out readmes for common code and sprites

* Move images to assets directory

* Move destinatin of shared browserified file

* remove unused file

* move compiled js to client-old

* Fix karma tests

* fix: Correct paths for sprites

website/common/script/fns/randomVal.js

@@ -0,0 +1,12 @@
+import _ from 'lodash';
+import predictableRandom from './predictableRandom';
+
+// Get a random property from an object
+// returns random property (the value)
+
+module.exports = function randomVal (user, obj, options = {}) {
+  let array = options.key ? _.keys(obj) : _.values(obj);
+  let rand = predictableRandom(user, options.seed);
+  array.sort();
+  return array[Math.floor(rand * array.length)];
+};