Update simple_poll with timeout 0 and object arg

**Why timeout 0?**
Sometimes we want to poll without timing out.

**Why an object argument?**
It's helpful to pass these extra properties by name.
`simplePoll(cb, { timeout: 0 })` is nicer than
`simplePoll(cb, undefined, 0);`

app/assets/javascripts/lib/utils/simple_poll.js

-export default (fn, interval = 2000, timeout = 60000) => {
+export default (fn, { interval = 2000, timeout = 60000 } = {}) => {
   const startTime = Date.now();
 
   return new Promise((resolve, reject) => {
     const stop = arg => (arg instanceof Error ? reject(arg) : resolve(arg));
     const next = () => {
-      if (Date.now() - startTime < timeout) {
+      if (timeout === 0 || Date.now() - startTime < timeout) {
         setTimeout(fn.bind(null, next, stop), interval);
       } else {
         reject(new Error('SIMPLE_POLL_TIMEOUT'));