Mailto Constructor.

@param {HTMLElement|String} form
@param {Object=} options
@constructor
function Mailto(form, options){
  /**
   *
   * @type {HTMLElement}
   */
  this.form = null;

  /**
   *
   * @type {boolean}
   */
  this.preventDefault = true;

  /**
   *
   * @type {Function}
   */
  this.formatter = Mailto.defaultFormatter;

  /**
   *
   * @type {Function}
   */
  this.onSubmit = function(m){};

  this.initFormObject(form);
  this.initOptions(options);
  this.initFormHandler();
}