code: function DiscogsOAuth(auth){
  	this.config = util.merge({}, defaultConfig);
  	this.auth = {method: 'oauth', level: 0};
  	if(auth && (typeof auth === 'object') && (auth.method === 'oauth')){
  		util.merge(this.auth, auth);
  	}
  }
docs: Object constructor
  @param {object} [auth] - Authentication object
  @returns {DiscogsOAuth}