PR for v.1.0.0-rc5

[hcpchris]

• Bug fixes to Jupyter Labs rendering.
• Bug fix for timestamp serialization of timezone-naive datetime objects.
• Bug fix: typo in Plot Bands serialization.
• Added null support to color validation.
• Bug fix in style deserialization.
• Bug fix in CartesianData.from_array().
• Fixed NaN handling in .load_from_pandas().
• Fixed JSON deserialization in .from_array().
• Added support for stylesheet links in Jupyter Labs context.
• Several bug fixes in JS literal serialization.
• Major improvements to JavaScript module inclusion.

[codecov]

Codecov Report

Merging #26 (856080d) into master (a47c494) will decrease coverage by 0.64%.
The diff coverage is 23.30%.

@@ Coverage Diff @@ ## master #26 +/- ## ========================================== - Coverage 91.40% 90.77% -0.64%  ========================================== Files 196 196 Lines 24731 24924 +193 Branches 1551 1595 +44 ========================================== + Hits 22605 22624 +19  - Misses 1564 1707 +143  - Partials 562 593 +31 

Impacted Files	Coverage Δ
highcharts_core/options/series/data/bar.py	81.14% <0.00%> (-3.73%)	⬇️
highcharts_core/options/series/data/base.py	85.03% <0.00%> (-3.00%)	⬇️
highcharts_core/options/series/data/boxplot.py	79.85% <0.00%> (-2.98%)	⬇️
highcharts_core/options/series/data/bullet.py	66.66% <0.00%> (-5.47%)	⬇️
highcharts_core/options/series/data/cartesian.py	72.27% <0.00%> (-5.67%)	⬇️
highcharts_core/options/series/data/connections.py	65.97% <0.00%> (-7.59%)	⬇️
highcharts_core/options/series/data/pie.py	78.75% <0.00%> (-5.25%)	⬇️
highcharts_core/options/series/data/range.py	80.98% <0.00%> (-5.30%)	⬇️
...ighcharts_core/options/series/data/single_point.py	66.79% <0.00%> (-6.88%)	⬇️
highcharts_core/options/series/data/sunburst.py	77.19% <0.00%> (-7.43%)	⬇️
... and 31 more

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