config method can be made asynchronous

[mageshpandian91]

Initial loading of features in an asynchronous way can be improvised.

Let us assume someAysnchronousFunction is returning features loaded from redis

fflip.config({ criteria: {}, 
                     features: someAysnchronousFunction, 
                     reload: anyInterval });
fflip.isEnabledForUser(feature, user);  // This is returning null as the features are not yet loaded

can this be like

fflip.config({ criteria: {}, features: someAysnchronousFunction, reload: anyInterval }, function(){
  fflip.isEnabledForUser(feature, user); 
})

[ismriv]

I'm interested in this too.

@FredKSchott is this module still maintained? It's quite popular, but last commit is almost 2 years old. I can put together a PR if it would be merged and released.

[FredKSchott]

@ismriv definitely, I'd love some help! This has been too far down on my todo list unfortunately. Happy to review any PRs though if you're interested