Firest draft of the "How to Organize Configuration Files" cookbook
Replaced the "Hello World" example to avoid confusion with AcmeDemoBundle
use a placeholder for the constructor arguments
Reworded the beginning of one section
Added all the suggestions made by reviewers
Replaced "AcmeWebsiteBundle" by "AcmeDemoBundle"
Added the latest suggestions made by reviewers
Fixed the link to another cookbook article
Added suggestions made by @cordoval
Fixed the target of one cookbook article link
Removed the "Directory Loading" section because it doesn't work out of the box
Added more suggestions made by @xabbuh
Removed redundant configuration blocks
Added a note for users with an existing AcmeDemoBundle
Updated docs for Monolog "swift" handler in cookbook.
[book][cache][tip] added cache annotations.
added Github teams for the core team
Reworded bundle requirement
Fixed (again) a minor typo: Toolbet --> Toolbelt
usage of a non-default entity manager in an entity user provider

The cookbook on entity user providers for the Security component only
describes how to create an entity provider using the default entity
manager. This may not be sufficient enough if you have multiple entity
managers and therefore be eplicit with the entity manager to use in
the user provider.