spec: add cniVersion to results and config
spec: add cniVersion to results and config

Version all artifacts using semantic versioning
so that plugins and container runtimes coded against
different versions of the spec can interoperate.

Fixes #44

dcbw/cni,rosenhouse/cni,appc/cni,aanm/cni,containernetworking/plugins,squaremo/cni,achanda/cni,jonboulle/cni,squaremo/cni,kad/cni,squeed/plugins,tomdee/cni,luxas/cni,containernetworking/cni,mcastelino/cni,tomdee/cni,steveeJ/cni,appc/cni,aanm/cni,squeed/plugins,mcastelino/cni,containernetworking/plugins,containernetworking/cni,achanda/cni,murat1985/cni,kad/cni,dcbw/cni,jonboulle/cni,murat1985/cni,tangle329/cni,steveeJ/cni,luxas/cni,tangle329/cni,rosenhouse/cni