Expose an API to manually pause polling

[kevinyuliawan]

For instance, I'm using 'ember-pollboy' to poll every 5 seconds for songs in my library, and I use those songs in a 'multi-select' component. But when I have the multi-select dropdown open, the polling service still runs and thus causes my multi-select component to go into a loading state momentarily when the polling happens.

Perhaps there should be an API to call something like this.get('songsPoller').pause() and .resume(). That way I can pause polling when the dropdown is open, and resume it once it's closed.