code: function(tox, opts) {
    if(!opts) opts = {};
    var libpath = opts['path'];
  
    this._tox = tox;
    this._toxav = this.createLibrary(libpath);
  }
docs: Construct a new ToxAV.
  @class
  @param {Tox} tox       - Tox instance
  @param {Object} [opts] - Options
  @param {String} [opts.path] toxav library path, will use the
  default if not specified