Changelog

c1cc2418 add devtool latest version check to all commands on startup
f650dacb add line to update current helm app
83ce126b chart: use official helm client to do all the heavy lifting
c11fc19b check chart version # against version # in devtool.config, give alert if newer one exists
469359a7 compare chart version against cm.qa.k8s.psu.edu/index.yaml
e1b3a33b fix missing return in error check
9579fbf8 remove duplicated check