Add visual indicator when a fatal failure occurs

When a fatal failure occurs, a error indicator is added to the status bar, flashes red once, and then turns back to transparent background.

A modal dialog will open when the indicator is clicked, reporting the error, and providing a way to go to the error in the document.

The status bar indicator will go away as soon as Reporter.prototype.checkFatal returns false (no more fatal error).

The formatting and text can probably be worked on, but this is my initial commit for this subject.
Unfortunately, the only name that I can access passed from there is not formatted too well:
```
{name: "jshint", language: "javascript", settingsFile: ".jshintrc", lint: function}
```

Perhaps we should go with this message: `Interactive Linter Error!`? It is slightly misleading, but I can't really think of anything better right now. Any thoughts?

I could do a object with the linter names as keys (`{ jshint:"JSHint" }`) but I don't like that as it creates a dependency on keeping that up to date.