arcgisapiforjs,textSymbol需要的pbf字体，字体包括abril-fatface-regular,alegreya-bold,arial-bold,arial-bold-italic,arial-italic,arial-regular,arial-unicode-ms-bold,arial-unicode-ms-regular,merriweather-bold,merriweather-bold-italic,merriweather-italic等17种字体，字体的使用请参考config.fontUrl方法
