Inline message view

Show lint messages inline, next to the code that it applies to. 

![atom-inline-messages](https://raw.githubusercontent.com/mdgriffith/atom-inline-messages/master/img/inline-comments.gif)

Theres a new setting to enable the inline messaging.  I did also mess with the default config to stop the statusbar viewer and activate the inline messenger.  

It looks to be running fine for me, but probably needs a bit more testing than that :)

This was from a previous design where the message was to the far right of the lint highlighting, so lightly highlighting the whole line made sense.  In the current design it doesn't, so this is removed.