Suggestion for Error Handling

[straticsryan]

Hey,

Currently, if a channel has gone away and we attempt to send an action for that channel it'll throw a requests.exceptions.HTTPError (404).

That's fine and I understand why that is thrown. However, it would be nice to have the ari client catch the raw HTTPErrors and have its own exceptions (ari.exceptions).

This way, when using the client, we can catch exceptions like ari.exceptions.ChannelNotFoundException or however you want to name it and not have to catch the underlying requests.exceptions.

Ryan