Add code in message to help developer

[stephanebachelier]

jshint is powerful enough to disable some validation when it finds a special comment.

As I am kind of lazy, or in other words I don't like losing my time to find the custom jshint code to add the correct comments, I want the code W098 for example to be added to the message which is really helpful. I don't say that you should always use the special comments, the .jshintrc file is the way to go. But sometimes it's needed because you may not have full control, or you need to respect some API. bla bla bla

FYI, the jshint codes are available here:
https://github.com/jshint/jshint/blob/master/src/messages.js

Because I really want this, here what I've done:

• on render info message not as an error #26 to render the info message not as an error
• forked AtomLinter/Linter to add a @formatMessage
• create a new branch on my fork of AtomLinter/linter-jshint to implement the new @formatMessage

Hope you will accept these contributions :)

[dmnd]

Thanks! I think everything is merged now.