Remove 1.8 specific builds from travis config
Remove 1.8 specific builds from travis config

AndreasBomholtz/rbczmq,methodmissing/rbczmq,ged/rbczmq,AndreasBomholtz/rbczmq,methodmissing/rbczmq,methodmissing/rbczmq,ged/rbczmq,ged/rbczmq