add canSetState property

[zzq889]

resolve #6

[cooperka]

@zzq889 are you getting issue #6 also? Do you have any repro steps (or, even better, a sample app)? I'd like to tackle the root cause rather than just suppress the warning like this.

[zzq889]

@cooperka I met this issue when I pop an instance view of react-native-tab-view which contains a ImmutableListView for each tab. I suppress the warning because it won't affect any UI problem.

[cooperka]

Thanks for the info @zzq889, it makes sense now why the warning happens. Since setState is being called asynchronously in runAfterInteractions, that makes it particularly likely to have issues. I refactored your commit a tiny bit to clean up, and it LGTM!