rename cli to mojito

todo:change package.json to "bin":"bin/mojito" when ready
misc
trim deps
put notes somewhere more appropriate..
provide callback
use npmlog not console; pull in help, version; export name, version
put back istanbul
log shim
rm unused
suppress log output, test help error message, log stack
test minor
log err
minor
catch nonesuch cmd, and add setpath() instead if (ugly) mock
add filesystem mock for bundled mojito cli.js
enable passthru cmd test