This commit makes the pretty JSON check more verbose when it encounters
errors, that way developers can see which lines are causing errors in
order to debug.
The indent parameter for json should be integer and under Python2 is
will raise an error if not. So switch from str to int and mention
default value in help text.
* The simplejson module is only needed for <=py25 so replace with builtin json.
* Replace six dependecy for simple Py2 check for convertion to unicode.
* Cleanup quotes.
This new hook allows to standardize one's JSON files (sorted key/4
spaces indent).
By default it just fails if any file is not complying with the standard,
but you can also pass the arg `--autofix` and the hook will
pretty-format the file itself.
Good in use combined with the `check-json` hook.
