Support tuple or None name for Series and Index.

[ueshin]

No description provided.

[codecov-io]

Codecov Report

Merging #776 into master will increase coverage by <.01%.
The diff coverage is 98.7%.

@@            Coverage Diff             @@
##           master     #776      +/-   ##
==========================================
+ Coverage   94.28%   94.28%   +<.01%     
==========================================
  Files          32       32              
  Lines        5771     5777       +6     
==========================================
+ Hits         5441     5447       +6     
  Misses        330      330

Impacted Files	Coverage Δ
databricks/koalas/generic.py	95.91% <ø> (ø)	⬆️
databricks/koalas/typedef.py	82.69% <100%> (-0.12%)	⬇️
databricks/koalas/indexing.py	92.51% <100%> (ø)	⬆️
databricks/koalas/groupby.py	89.85% <100%> (-0.28%)	⬇️
databricks/koalas/indexes.py	99.13% <100%> (+1.83%)	⬆️
databricks/koalas/namespace.py	86.13% <100%> (ø)	⬆️
databricks/koalas/utils.py	97.93% <100%> (ø)	⬆️
databricks/koalas/mlflow.py	94.87% <100%> (+0.13%)	⬆️
databricks/koalas/internal.py	95.89% <100%> (-0.41%)	⬇️
databricks/koalas/series.py	95.13% <96.42%> (-0.07%)	⬇️
... and 2 more

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[softagram-bot]

Softagram Impact Report for pull/776 (head commit: 9817c0f)

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[ueshin]

Thanks! merging.