Upgrade npm in travis for nodejs 0.8
Upgrade npm in travis for nodejs 0.8

Moharu/node-expat,noahjs/node-expat,Moharu/node-expat,julianduque/node-expat,node-xmpp/node-expat,noahjs/node-expat,node-xmpp/node-expat,node-xmpp/node-expat,julianduque/node-expat,Moharu/node-expat,noahjs/node-expat,julianduque/node-expat