Allow submitting of user feedback via server-side clients


#1

For example, the raven-python should have a method that lets you submit user feedback.

This would be useful in applications that do not want a hard dependency on sentry and thus already have their own error reporting functionality. When using Sentry this would allow to simply attach the user’s feedback (entered in a dialog provided by our application) to the sentry event instead of sending an email.

Name and email should actually be optional there (maybe in the client-side version too, ideally configurable), as user feedback is valuable even from someone anonymous.