Routing auto rewrite

| Q   | A
| --- | ---
| Doc fix? | yes
| New docs? | yes
| Applies to | all
| Fixed tickets | partially #262 

I changed to a forum example, for 2 reasons:

 1. Let's show people that you can also create other things with the CMF than just blogs :)
 2. The blog example didn't really fit the RoutingAuto bundle, as the blog routes should be static routes

When you want to review something: I rewrote everything :)

@dantleech : In the docs, you use the `format` option for the auto increment action a couple times. I cannot find any code for this, does the option really exists? And, if it does not, what about throwing an exception when there is a not existing option?