DougEdey/StrangeBrew — pull request #166 by csaunders (2013-08-29 00:43:58+00:00)
Title: Fixes incorrect calculation of Specific Gravity from provided GU

Something wasn't looking quite right when I dove in here, and was a little thrown off. I [grabbed another calculator](http://pint.com.au/calculators/gravity/) to be sure my original thoughts were correct and it appears they were.

I'd write up some tests, but I'm doing this PR from the github editor.