No longer throw custom error codes on failure.
No longer throw custom error codes on failure.

asciidisco/grunt-qunit-istanbul,labertasch/grunt-contrib-qunit,labertasch/grunt-contrib-qunit,gruntjs/grunt-contrib-qunit,paladox/grunt-contrib-qunit,paladox/grunt-contrib-qunit,gruntjs/grunt-contrib-qunit,asciidisco/grunt-qunit-istanbul