Cuil，表示和验证电路，点火钥匙和密码

Quick start (Java interface): ``` import ar.gov.id.*; code = new CuilCuitCdi("20-12345678-6"); if ( code.isVerified() ) { System.out.println("Code is verified!"); } ``` Interpretation Validation and representation based on official documentation (government supported.) CUIL: Código Único de Identificación Laboral (C.U.I.T.) CUIT: Clave Única de Identificación Tributaria (C.U.I.T.) CDI: Clave de Identificación (C.D.I.) Possible inputs include: hh-bbbbbbbb-v, hhbbbbbbbbv, hh-bbbbbbbb, hhbbbbbbbb, hh bbbbbbbb, etc. With hh head code, bbbbbbbb identifier body and v verifier digit. Elements h, b, v are digits; v is optional (if not given