The calculator I always wanted

[vanLudwig]

I released a new beta today.

• Spanish, French, Italian, and Portuguese have been professionally translated; German, Russian, Korean, and simplified/traditional Chinese have been machine translated.
• I made a lot of usability improvements to the equation solver. Adding units in the previous beta revealed some overall clunkiness that I wanted to fix.
• I had to update the in-app purchasing to comply with Google's new standards. This should only affect buyers who defer payment.
  

I unfortunately realized a little too late that a compiler flag I changed to help me debug was doubling the size of the app install. I'll rebuild for final release, but since the beta already went out, I figured I'd let the testers bang on it a few days.