- Support dragging multiple files, and load them all.

- Removed e.preventDefault:
Didn't need it. We prevent defaults on app startup.

- Removed stopPropagation:
I figured we might want, in the future, to catch these kind of events
from different places.

- Support for Open with File Dialog.
Works good, but we still need css classes for the button.
Merge pull request #19 from ivantodorovich/feature/customSubs

A few tweaks on Feature/CustomSubs