Update  'grunt-contrib-jshint'

Take advantage of the added ability to use comments in https://github.com/gruntjs/grunt-contrib-jshint/commit/95aee7ba76bfe8f04c2b23814d6c98e7e9d5b1b6.

Merged .jshintrc file with the official example .jshintrc file, this gives us inline comments and a easy to understand .jshintrc file.