add node.js ver 0.8 to .travis.yml
add node.js ver 0.8 to .travis.yml

pcon/jsforce,nutthawan/jsforce,bhaskarmelkani/jsforce,saleswise/jsforce,bhaskarmelkani/jsforce,polidog/jsforce,joeferraro/jsforce,jdcrensh/jsforce,saleswise/jsforce,kimchouard/jsforce,lkatney/jsforce,jsforce/jsforce,parthiban019/jsforce,parthiban019/jsforce,joeferraro/jsforce,pcon/jsforce,jdcrensh/jsforce,jsforce/jsforce,jesperkristensen/jsforce,nutthawan/jsforce,lkatney/jsforce,rdietrick/jsforce,saleswise/jsforce,jesperkristensen/jsforce,jsforce/jsforce,stomita/node-salesforce,pcon/jsforce