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
[Book] consistent and complete config examples

Make configuration examples in the book consistent throughout the
different configuration formats. Also fixing several syntax issues.
Fix class name in ConsoleTerminateListener example
add order of translation formats

The preferred order of the different translation formats in
configuration blocks is Xliff, YAML, PHP. Thus, this has to be
documented in the contributing section. Since the order being used
before was Xliff, PHP, YAML, existing examples had to be modified
accordingly.