Use console.debug when available

[RazerM]

Fixes #12

Please check one:

• New tests created for this change
• Tests updated for this change

This PR:

• Adds new API
• Extends existing API, backwards-compatible
• Introduces a breaking change
• Fixes a bug

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I think the existing fallback to console.log will work. Let's see if node 6 tests pass in CI.

[RazerM]

@shellscape can you get CI working. I guess you don't have it running on a schedule so it's hard to contribute.

[shellscape]

CI is fixed. Once the conflicts are cleaned up you should be good.

[codecov]

Codecov Report

Merging #13 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #13      +/-   ##
=========================================
- Coverage   92.43%   92.3%   -0.13%     
=========================================
  Files           4       4              
  Lines         119     117       -2     
=========================================
- Hits          110     108       -2     
  Misses          9       9

Impacted Files	Coverage Δ
lib/factory/MethodFactory.js	80.95% <ø> (-0.87%)	⬇️

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[RazerM]

@shellscape I don't know why Travis CI didn't respond but this should be good to merge

[shellscape]

I'll check it out

[shellscape]

@RazerM sorry this took a while to get merged. Slipped under the radar for a bit.