Console-browerify should be a hard dependency

Console-browserify is set a dev dependency but is referenced `stable/jshint.js` https://github.com/jshint/jshint/blob/master/src/stable/jshint.js#L47

This results the error below if you're using jshint's api rather than the bin, as you would within grunt plugins for example.

```Error: Cannot find module 'console-browserify'```

This is because npm doesn't automatically install dev dependencies for project dependencies.