0.8.6 thanks to @calebthebrewer

see #8

refactored

- refactored. api is backward compatible

- a callback function can now be passed as the second arg for processing each comment object as it's parsed

- no longer uses esprima because of how slow it was

- comment key is now the line number
- strings are now parsed by default
- `.fromFile()` must be used to parse files/globs