Config.json accepts 2 repos url

- this is usefull for projects which use a magento git repository for htdocs
and a git repository for the project specifics
Updated the way we set project_root and clean_up() task
Updated git_clone method

- The main project gets cloned in the project root
- If we use also a magento repository, gets cloned in the magento_root folder
Updated get_local_xml to use a predefined template

- If local.xml.local is created in /vagrant that file is copied in the project
- Or local.xml.template is copied in the project app/etc folder and $KEY &
$DB_NAME get the key from the remote server + the host_url is set as a db name
Small update for get_database_dump() on how to call n98-magerun.php on remote server
Updated get_database_dump() task: gziping the sql before download
Added updated_dependencies() task for composer
Added create_vhost_conf() task
Updated the compass() method to run inside the fabfile