Add `.jshintrc` to JSON filenames

JSHint tool for linting JavaScript uses `.jshintrc` configuration file.
It is in JSON format.

Example: https://github.com/jquery/jquery/blob/master/.jshintrc
Nicer debug factoring
Merge pull request #836 from github/debug

Nicer debug factoring
Merge pull request #835 from hkdobrev/jshintrc

Add `.jshintrc` to JSON filenames