Bulk export (#684)

* First pass (working) collection export to zip

* Add export confirmation screen

* 👕

* Refactor

* Job for team export, move to tmp file, settings UI

* Export all collections job

* 👕

* Add specs

* Clarify UI

shared/utils/unescape.js

@@ -0,0 +1,7 @@
+// @flow
+
+const unescape = (text: string) => {
+  return text.replace(/\\([\\`*{}[\]()#+\-.!_>])/g, '$1');
+};
+
+export default unescape;