Speed up delimiter token check
Helps if I return things =/
Merge pull request #276 from iarna/refactor-metatable-upgrade

Helps if I return things =/
Speed up is_whitespace token check
Speed up is_num token check
Guard is_reserved with a cheap check, killing a huge amount of time
Minor speedup to is_delimiter
Stop faking preg matches
Merge pull request #277 from aredridel/speedups

Speedups