Change on the behavior of d3 visualization

[tiagofilipe12]

I have passed an environmental variable for d3 visualization tool to be triggered. Now it is only started when we pass the D3_LOGGER environmental variable to the shell before running the script. Also, I added these changes to the docs.

[codecov-io]

Codecov Report

Merging #86 into master will decrease coverage by 0.31%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
- Coverage   82.09%   81.78%   -0.32%     
==========================================
  Files          37       37              
  Lines         905      906       +1     
  Branches      110      111       +1     
==========================================
- Hits          743      741       -2     
- Misses        162      165       +3

Impacted Files	Coverage Δ
lib/reducers/collection.js	84.61% <60%> (-3.17%)	:arrow_down:

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[thejmazz]

@tiagofilipe12 delete branch if its not needed