jshint/jshint — pull request #867 by mbulman (2013-02-19 04:40:47+00:00)
Title: Allow all function params to be checked by 'unused'

This allows passing a value other than true/false to the 'unused' option to allow for checking all function params. For
example:

function foo(a, b) {
return b;
}

If 'unused' === true, no warnings will be thrown, since 'b' is used. If 'unused' === 'all', then a warning will be
thrown, since 'a' is not used.

References:
* Makes GH-607 the default, but optional, rather than mandatory
* Closes GH-778