/**
 * @class TextToSpeechJs
 * @extends jibo.bt.Behavior
 * @memberof jibo.bt.behaviors
 * @description Makes Jibo speak.
 * @param {Object} options See {@link jibo.bt.Behavior|Behavior} for all options.
 * @param {Function} options.getWords Function that returns a string of the words for Jibo to speak.
 * @param {Function} options.onWord Called each time a word is spoken. The word that is spoken is passed as an argument.
 */