Drop dependency to phoenix and replace by phoenix_pubsub (1.2?)

[annard]

Hi there!

More a feature request i suppose...

With the upcoming release of phoenix_pubsub 1.2, would it be desirable to drop the dependency on phoenix and use phoenix_pubsub instead? This would make for a smaller package if you don't need phoenix but would like the nice abstraction of pubsub with different backends.

Thanks,
Annard