add test for slideshare spec #78
add test for slideshare spec #78

riking/onebox,aceofspades/onebox,techAPJ/onebox,billy3321/onebox,techAPJ/onebox,fantasticfears/onebox,tarzan/onebox,techAPJ/onebox,billy3321/onebox,discourse/onebox,billy3321/onebox,aceofspades/onebox,tarzan/onebox,tarzan/onebox,discourse/onebox,aceofspades/onebox