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/ops/deletePM.js

@@ -0,0 +1,9 @@
+import _ from 'lodash';
+
+module.exports = function deletePM (user, req = {}) {
+  delete user.inbox.messages[_.get(req, 'params.id')];
+  user.markModified(`inbox.messages.${req.params.id}`);
+  return [
+    user.inbox.messages,
+  ];
+};