veyron.js:  Increase minimum required version of jshint.
veyron.js:  Increase minimum required version of jshint.

Our code is not compatible with the old version.

Change-Id: Icb48c7d37150664057f5b48f6fc92ada3572e8dc

vanadium/js,vanadium/js,vanadium/js,vanadium/js