attach logs to magellan main process

[archlichking]

1. attach sauce replay url to magellan worker's output
2. ignore calling saucelabs api to report result if no sessionid is found

[codecov-io]

Codecov Report

Merging #8 into master will decrease coverage by 0.68%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   88.23%   87.55%   -0.69%     
==========================================
  Files           9        9              
  Lines         459      474      +15     
  Branches       85       87       +2     
==========================================
+ Hits          405      415      +10     
- Misses         54       59       +5

Impacted Files	Coverage Δ
lib/logger.js	67.64% <0%> (-24.36%)	:arrow_down:
lib/executor.js	67.67% <0%> (-4.37%)	:arrow_down:
lib/profile.js	88.88% <0%> (+11.11%)	:arrow_up:

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[Maciek416]

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