Update xctool args to clean+build+test

Something in build #184 broke the travis CI with 'simulator
failed to start errors. Likely the Localizable.strings update.
Updating the xctool flags seemed to fix it.
Now using:
  - freshInstall
  - freshSimulator
  - ONLY_ACTIVE_ARCH
  - iphonesimulator7.0
Removed:
  - arch=i386