fixed json parsing madness by removing callback argument

Signed-off-by: Guyzmo <guyzmo+github@m0g.net>
added support for search and listings

 * modified the CLI API so it has an homogeneous <command> <args> syntax
 * added list/search comamnds to the CLI API
 * added PluzzSearch object that implement listing of searches on pluzz
 * added support of id instead of URL as resource identifier
   (with fallback to url for compatibility)

Signed-off-by: Guyzmo <guyzmo+github@m0g.net>