explain how to pass options to your own handler.

it wasn't clear where the user's handler options should go, after looking at the code and trying this is what I've found, correct me if there's a better way.
return true when transport.send returns undefined
Merge branch 'retry62' of git://github.com/marshall-lee/bullet
Merge branch 'patch-1' of git://github.com/marianoguerra/bullet