React vis feature dist

[tweddielin]

• Re-plot the feature distribution with react-vis
• In individual tab, now when we click a entity the feature distribution will change to the top important feature.
• Fix some bugs in query.

[codecov-io]

Codecov Report

Merging #75 into master will decrease coverage by 0.51%. The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   72.37%   71.85%   -0.52%     
==========================================
  Files           4        4              
  Lines         391      398       +7     
==========================================
+ Hits          283      286       +3     
- Misses        108      112       +4

Impacted Files	Coverage Δ
webapp/query.py	86.81% <100%> (+0.29%)	:arrow_up:
webapp/controller.py	64.45% <55.55%> (-0.89%)	:arrow_down:

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