use ruby1.9.3 instead 1.9.2 in travis
use ruby1.9.3 instead 1.9.2 in travis

flycutter/grit,gitcafe-dev/grit,rgroux/grit,flycutter/grit,gitcafe-dev/grit,rgroux/grit,gitlabhq/grit,gitlabhq/grit,abicky/grit