Catch on controller generator method exception

[ashfurrow]

See these relevant lines:

react-redux-controller/src/index.js

Lines 121 to 123 in 329066c

	this.controllerMethods = R.map(controllerGenerator =>
	injectedControllerGeneratorRunner(controllerGenerator)
	, controllerGenerators);

We should provide a way for library clients to attach an error handler to be run in the case that a controller methods throws.