support for update checking with semantic versioning added
related files added (&updated)
add s.py to ignore (used for local testing)
Merge branch 'master' of github.com:wercker/wercker-cli into update
Merge pull request #8 from wercker/add-metrics

Add metrics to CLI
update response updated. readme updated, version bump
Merge pull request #9 from wercker/update

Update command added & version bump
Allow user to override mixpanel token with env var
Merge branch 'master' into add-metrics