install npm 3 on travis builds
install npm 3 on travis builds

andreypopp/esy,FLGMwt/yarn,bsansouci/esy,onemen/yarn,MiguelAlho/yarn,andreypopp/esy,suitupalex/yarn,seripap/emojiless-yarn,CHECK24/yarn,dguo/yarn,andreypopp/esy,joeyespo/yarn,bsansouci/esy,FLGMwt/yarn,mgcrea/yarn,joeyespo/yarn,dguo/yarn,ConAntonakos/yarn,CHECK24/yarn,lawliet89/yarn,kasperlewau/yarn,bsansouci/esy,dxu/yarn,mourner/yarn,mvestergaard/yarn,suitupalex/yarn,mvestergaard/yarn,mgcrea/yarn,troydemonbreun/yarn,MiguelAlho/yarn,seripap/emojiless-yarn,kasperlewau/yarn,ConAntonakos/yarn,onemen/yarn,dxu/yarn,mourner/yarn,troydemonbreun/yarn,lawliet89/yarn