Add 'start-standalone' function

Start-standalone function allows to start an application without controller in a production environment. This function should be executed in application directory.

 * Recover manifest (with application permissions)
 * Generate a temporary token
 * Add/Replace application in database (usefull for cozy stack)
 * Reset proxy
 * Add environment variables (NAME, TOKEN and NODE_ENV)
 * Start application
 * When application is stopped (via a Ctrl-C) : 
     * Stop application
     * Remove application from database (usefull for cozy stack)
     * Reset Proxy