use Minimatch class to improve perf, fixes #29; fix RegExp handling

[UltCombo]

Improve negative globs handling perf and fix some issues with RegExp.

[coveralls]

Coverage increased (+1.55%) when pulling e7af5f8 on UltCombo:minimatch-class into 127eb2c on wearefractal:master.

[UltCombo]

@contra BTW, there is just one line missing to hit 100% coverage. Perhaps we should throw instead of returning true for unknown glob types? https://coveralls.io/files/408135441#L105

[UltCombo]

Here are the benchmarks to prove the perf gain.

Before:

After:

Benchmark source: sindresorhus/globby#10 (irrelevant globby data omitted)
The benchmark with fewer exclusions is slower because it has the overhead of emitting more matched files.

[UltCombo]

I may have misunderstood the regex matching part though, it would make more sense if the regexp.test() returns true == keep file, else filter it out.

[coveralls]

Coverage increased (+1.55%) when pulling e2f5e34 on UltCombo:minimatch-class into 127eb2c on wearefractal:master.

[UltCombo]

@contra PTAL when you have time.

[sindresorhus]

Nice!

[UltCombo]

Oh sorry, mixing too many topics here. Moved the glob-stream and globby topic to #31

[yocontra]

The RegExp stuff should keep the file if the regex returns true, otherwise filter it out as implemented. Want to write some tests to ensure this is happening?

[UltCombo]

@contra I did, see the files changed tab. 😃