version bump 0.8.0: performance

- separate i4/r8 code (core functions optimized by v8)
- prefer faster methods when convenient
- node-based performance tests

version bump 0.7.1: performance

- eliminated functional constructs
- simplified fraction handling
- better linting w/jscs

version bump 0.7.0: more intelligent tokenizer

- Literal characters between numbers (fixes #7, h/t @sysarchitect)
- .0/.00/.000 recognized as potential date tokens
- s+.0+ generates two tokens (with proper handling for `hh .00 .000`)
- proper handling of format strings with mixed 0 and #