stream locking

[ydarma]

This fixes the wait, run calls to enable use with object mode streams and asynchronous module loading.

fix #575 close #575

[codecov-commenter]

Codecov Report

Merging #576 (49598f2) into master (12cc602) will decrease coverage by 1.21%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
- Coverage   96.36%   95.14%   -1.22%     
==========================================
  Files           4        4              
  Lines         632      639       +7     
  Branches      148      148              
==========================================
- Hits          609      608       -1     
- Misses         23       31       +8     

Impacted Files	Coverage Δ
index.js	92.92% <33.33%> (-5.20%)	:arrow_down:
lib/results.js	99.34% <0.00%> (-0.66%)	:arrow_down:
lib/test.js	95.14% <0.00%> (-0.29%)	:arrow_down:

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[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (201e650) 96.76% compared to head (cb87b29) 95.72%.

Files	Patch %	Lines
index.js	33.33%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #576 +/- ## ========================================== - Coverage 96.76% 95.72% -1.04% ========================================== Files 4 4 Lines 742 749 +7 Branches 182 182 ========================================== - Hits 718 717 -1 - Misses 24 32 +8 ```

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