v0.3.1

Added

• Implemented emulation for
  halt-bug, passing one more of
  blargg's tests.
• Improved PPU performance.
• Improved JIT compiler performance and correctness.
• Added options to the bench subcommand for benchmarking only the interpreted
  or the JIT compiled version of the emulator, and for enabling/disabling
  optimizations.
• Allowed emitting a perf-$PID.map file when running the JIT compiler to
  enable profiling with JIT compiled code using perf.