File browser

Compliment for auto complete for paths.

Currently if a modal is open and you open file browser (Edit Series) then the original modal is lost, I played around with restoring the original modal when the file browser is closed, but it isn't very smooth and causes issues with updating the input i the original modal. A second modal with a larger z-index would hide the original one, but we'd still need to make sure we're handling bootstrap events properly (clicking outside of the modal) so we don't kill both modals.
If you're on C:\ you should be able to go up to the list of drives (which is returned when nothing is passed in), so the UI needs to understand that logic and do it for Windows only, if you're showing the list of drives you don't want an up button to allow it to go higher (because there is nothing there).

On *nix you need to stop at `/` and not go higher, this one isn't very difficult, but again its OS specific and more logic to put into the UI.