Remove trailing whitespace
Correct __dirname referenced paths
Comment out nonsense claim about consumers

Most consumers of this are testers, not developers
Explain how to get coho
Fix instructions for getting cli+lib and plugins
Add quietshell pushd/popd
support debug logging level
quit instead of return in top level code...
Refactor installPlugins, updateJS, summary

Only call them if there are platforms left
Require grunt-cli
Add could not find routine with coho instructions
Skip broken platforms