Added support for Configuration Blocks

[wouterj]

Q	A
Doc fix?	yes
New docs?	no
Applies to	all
Fixed tickets	#137

After this PR, there is really need for a custom theme, as they are not rendered that nice... http://sylius-try.readthedocs.org/en/latest/cookbook/extending-menu.html#example-usage

[QuingKhaos]

Oh, I tought they are rendered as tabs :O

[wouterj]

They are, if the theme styles it like that :)

[pjedrzejewski]

Nice, thank you @wouterj! I will add a custom theme as I wanted to add some Sylius colors etc.

[wouterj]

You're welcome @pjedrzejewski :)

Btw, if you host the API docs somewhere, I would also suggest to enable the sensio.sphinx.phpcode extension. This gives you 6 really nice roles:

Links to the related API docs:
:namespace:`Sylius\\Bundle\\CartBundle\\Controller`
:class:`Sylius\\Bundle\\CartBundle\\Controller\\CartController`
:method:`Sylius\\Bundle\\CartBundle\\Controller\\CartController::summaryAction`

Links to the related PHP.net docs:
:phpclass:`Datetime`
:phpmethod:`Datetime::format`
:phpfunction:`strlen`