Configurable default catch handler

[askot]

This patch allows initializing reflux-promise with default promise catch handler.

If function is not provided, no catch handler is not attached by reflux-promise. Which is important, because you might want to use error handling of your promise implementation instead.

For example, Bluebird fires an unhandledRejection event on unhandled exceptions. With current catch handler implementation this is never thrown.

Thoughts?

[devinivy]

I like this approach. It will be a breaking change, so I'd like to consider some other positive API changes as well– let me know if you have any ideas. Also– do you have the time to add tests for this feature? If not, we can make an issue for it and I can add the tests when I find some time.

[ponelat]

+1 can we get this merged?

[devinivy]

Anyone down to write tests for this?

[askot]

sorry for the long delay, finally managed to play around a bit with tests. I was able to construct a pretty understandable test case (IMO), please review.

[semikolon]

Looks good to me!

Would like to see this merged before I use this plugin more in my current project...