Statman

Improve statman reporting

Support statman.report to create output for metrics

What's Changed
* fix gauge return type by jasonray in https://github.com/jasonray/statman.py/pull/39
**Full Changelog**: https://github.com/jasonray/statman.py/compare/v0.2.0...v1.0.1

What's Changed
* History by jasonray in https://github.com/jasonray/statman.py/pull/36
**Full Changelog**: https://github.com/jasonray/statman.py/compare/v0.2.0...v1.0.0

What's Changed
* change stopwatch value to property
* add gauge metric

**Full Changelog**: https://github.com/jasonray/statman.py/compare/v0.1.3...v0.2.0

What's Changed
* Stopwatch.reset
* Stopwatch.restart
* Stopwatch.print
* switch from time.time => time.perf_counter

**Full Changelog**: https://github.com/jasonray/statman.py/compare/v0.1.2...v0.1.3