add onebox-avatar class to enforce proper sizing 
add onebox-avatar class to enforce proper sizing 

https://avatars.githubusercontent.com may fail to provide a 96x96 avatars even when specifying  s=96 in the URL
on auto generated avatars. uploaded avatars are fine.
tarzan/onebox,tarzan/onebox,aceofspades/onebox,techAPJ/onebox,techAPJ/onebox,billy3321/onebox,billy3321/onebox,aceofspades/onebox,aceofspades/onebox,techAPJ/onebox,billy3321/onebox,discourse/onebox,discourse/onebox,tarzan/onebox