Fixing to Choropleth width and int type error

[dorisjlee]

Overview

@cjachekang reported an issue with integer type geographic columns, as shown in the communities dataset.

This PR fixes the issue and displays the integer state columns based on their FIPS directly.
In addition, this PR also increases the width of choropleth charts so that the visualizations don't appear to be too squished horizontally.

[codecov]

Codecov Report

Merging #395 (7fc298e) into master (2b6e162) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
+ Coverage   84.93%   85.02%   +0.08%     
==========================================
  Files          52       52              
  Lines        4030     4033       +3     
==========================================
+ Hits         3423     3429       +6     
+ Misses        607      604       -3     

Impacted Files	Coverage Δ
lux/vislib/altair/AltairChart.py	91.80% <100.00%> (+0.27%)	⬆️
lux/vislib/altair/Choropleth.py	92.95% <100.00%> (+8.67%)	⬆️
lux/vislib/altair/Heatmap.py	93.10% <0.00%> (-3.45%)	⬇️
lux/vislib/matplotlib/Heatmap.py	96.66% <0.00%> (-1.67%)	⬇️
lux/vislib/matplotlib/ScatterChart.py	75.58% <0.00%> (-1.17%)	⬇️

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