[proposal] Problems be renamed to "Feedback"

[gnetsys]

As stated in the definition for a problem:
// throw a custom problem
if (self.user === null)
self.problem('User is offline.');
self.plain('homepage');
});

or

framework.route('/forbidden/', function () {
var self = this;
self.view403('A visitor was denied.');
// IMPORTANT:
// self.view500(error)
});

I propose a rename.

[petersirka]

I thought about it, but I can't to rename it. It's too late.