Some examples can't be tried out

[silvenon]

In my opinion, each example should be complete and not use some off-screen code, because I personally find the code a lot harder to understand if I can't try it out. One example is the Interface concept of the Decorator Pattern, where the Interface class is pre-defined.

[addyosmani]

That's a reasonable request. We will try to address this in a future release.

[addyosmani]

Solve as part of #88