Added more formats (mostly templating)

As promissed, I've updated the core and block bundle docs to reflect the templating changes I made.

I recommend to wait merging this until these PRs are merged:

 - sonata-project/SonataAdminBundle#1456
 - symfony-cmf/BlockBundle#82

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | yes ( symfony-cmf/CoreBundle#62, symfony-cmf/CoreBundle#67, symfony-cmf/BlockBundle#76, symfony-cmf/BlockBundle#82, sonata-admin/SonataBlockBundle#78
| Applies to    | all
| Fixed tickets | -