optimizer: Add missing package.ceylon

This is needed to build for android. oops.
android: Rebuild when ceylon dependencies change
optimizer: Switch to singlethreaded mode

this uses:

- on mac intel i7/jvm: 0.5x cpu time, 2x realtime (for ~150ms)
- on android snapdragon 800/art: 0.5x cpu time, 0.44x realtime (~20
  seconds; arm or android or art or something seem to be pretty bad
  at locking or something.)
optimizer: Add guava to repository, so CachedFitnessEvaluator works
android, optimizer: Refactor code for performance testing