lib/vcard.js
function( key, value, params ) {
    var prop = new vCard.Property( key, value, params )
    this.addProperty( prop )
    return this
  }
function( key, value, params ) {
    var prop = new vCard.Property( key, value, params )
    this.addProperty( prop )
    return this
  }
function ( key , value , params ) { var prop = new vCard . Property ( key , value , params ) this . addProperty ( prop ) return this }
Add a vCard property
@param {String} key
@param {String} value
@param {Object} params
Add a vCard property