[new] Used unix commands to replace the PHP helper
[new] Improved the adding of the host
[new] Removed trailing "./"
[new] Used restart instead of reload for apache
[new] Added usage message

When the wrong number of arguments are given, a usage message
will be printed and the script will exit.

Also a small refactoring has been done: script variables have been
given descriptive names.
[new] Updated the documentation

Fixed some typos (`bundles` changed to `project`, etc), improved
the VERSIONNING.md file and added the CONTRIBUTING file.

Also moved skeleton to skeletons.
[new] Added the documentation files
[new] Added the removal of Symfony's documentation files
Merge branch 'refactoring/new' into develop