Series.to_list

[garawalid]

Resolves #362

[garawalid]

@HyukjinKwon I'm wondering if we add tolist in series.rst because it's not there in pandas doc.

[codecov-io]

Codecov Report

Merging #379 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
+ Coverage   94.64%   94.64%   +<.01%     
==========================================
  Files          41       41              
  Lines        4405     4408       +3     
==========================================
+ Hits         4169     4172       +3     
  Misses        236      236

Impacted Files	Coverage Δ
databricks/koalas/missing/series.py	100% <ø> (ø)	⬆️
databricks/koalas/series.py	93.25% <100%> (+0.05%)	⬆️
databricks/koalas/tests/test_series.py	100% <100%> (ø)	⬆️

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[HyukjinKwon]

Hm, this one and to_records are actually closer to violate https://github.com/databricks/koalas#guardrails-to-prevent-users-from-shooting-themselves-in-the-foot

Maybe we have to deprecate them or remove in the future. Let me add it for now since we already have to_records

[HyukjinKwon]

Thanks, @garawalid