[FrameworkBundle] tada animated exceptions

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

I totally agree that changes proposed in #10729 are much needed and to be honest, I'm a bit annoyed that nobody fixed that earlier. But the fix is obviously wrong and still buggy. So, after a lot of hard work, I finally fixed the thing with a much better alternative that should make everyone happy and will make debugging Symfony issues much easier for everyone. YMMV of course.

![untitled](https://cloud.githubusercontent.com/assets/47313/2747994/43050b44-c79d-11e3-8cf2-9ae534abb1f3.gif)