Holy Macoroni! Three updates in one day! I have too much time on my hands. Anyway here's v0.4. I have not added area support like I said I would. Instead, thanks to an idea by Kikuchiyo, I have added data support. You know, Kilobytes and Megabytes? I have also added a minor graphical change. Here's the links.
In the next version I plan on adding area support. I also plan to add a few other units to the "Length" section. Look out for it soon!