Disable Node 0.6 on Travis CI.
Disable Node 0.6 on Travis CI.

bartuspan/passport,Faiz7412/passport,pandeysoni/passport,ernestopino/passport,DaAwesomeP/passport,dentrinh/passport,imjerrybao/passport,arover/passport,modulexcite/passport,wakashige/passport,kidaa/passport,Rosmina/createAccount,jameswomack/passport-restify,mcanthony/passport,kolomiichenko/passport,bevacqua/passport,qitianchan/passport,jaredhanson/passport,Trult/passport,shubham13jain/passport