support SemVer objects in cmp function
support SemVer objects in cmp function

megawac/node-semver,ekmartin/node-semver,npm/node-semver,you49net/Repos,thenaughtychild/node-semver,stevemao/node-semver,jasonkuhrt/node-semver,hippich/bower-semver,stealjs/node-semver,bitovi/node-semver