0.5.0

• Added OPT-4 optimization. Frame locals (named variables known at compilation) using the LOAD_FAST, STORE_FAST and DELETE_FAST
  opcodes will use native .NET locals instead of using the frame's f_localsplus array.
• Improved performance in LOAD_FAST and STORE_FAST through OPT-4
• Added OPT-5 optimization. Frame push/pop on entry/exit are now inline CIL instructions.
• LOAD_FAST skips unbound local checks when proceeded by a STORE_FAST (i.e. slot is definitely assigned)