In Interceptor It should listen for Every 4* errors

I am using `angular-devise` in one of my projects.
Project code functionality Needs to listen every 4\* errors.

But due to `angular-devise` library could not provide we have to use a workaround.

It would be good if this feature implemented in the library.
And broadcast every 4\* errors.

Please Correct me if I am wrong.

Thanks
If you open for PR I will fix it.
