Allow progress up to 99999.

[kaj]

I hope this fixes #15.

[fehmicansaglam]

Thanks for the PR. I suppose bar width will not be adjusted correctly but let me try it.

[kaj]

Hm. Maybe width should be capped to progressWidth? As it is, I don't think progress > 999 is a problem, but progress > scale won't look too good.

So maybe something like this on ProgressedIOServiceActor.scala line 28:

val width = progressWidth * min(progress, scale) / scale

?