Check Windows case insensitive app name

On Windows if we run `node-debug app` and real file name is App.js,
we have two identical files in resources tree (app.js and App.js),
but we can't set breakpoints in App.js.
Perhaps you can add a new parameter to `inspectorUrlToV8Name` instead? It does not have to be full ScriptManager object, it can be a function to resolve v8 name.

```
var target = convert.inspectorUrlToV8Name(params.url,
  this._scriptManager.normalizeV8Name.bind(this._scriptManager));
```