Not all possible values are available

Hi there. Great minimalistic app, I like it very much.

I noticed today, that I can not select systolic values below 80, diastolic values below 50 and pulserates below 40.
Please make it possible (just starting from 0 on would be the easiest way).

Greetings

Here are the lines beginning that need to be changed:
https://github.com/daryldy/Heart/blob/master/src/ca/ddaly/android/heart/EditFragment.java#L101=

Update:
I can change the lines easy by myself, but I don't know how to compile the sourcecode to an apk, I'm not a developer.