Add configuration value: compute.max_rows

[itholic]

related with #718 i added compute.max_rows

[codecov-io]

Codecov Report

Merging #721 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #721      +/-   ##
==========================================
- Coverage   94.27%   94.16%   -0.11%     
==========================================
  Files          32       32              
  Lines        5572     5573       +1     
==========================================
- Hits         5253     5248       -5     
- Misses        319      325       +6

Impacted Files	Coverage Δ
databricks/koalas/config.py	100% <ø> (ø)	⬆️
databricks/koalas/frame.py	94.72% <100%> (-0.15%)	⬇️
databricks/koalas/plot.py	93.78% <0%> (-1.13%)	⬇️

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[HyukjinKwon]

Looks good otherwise

[itholic]

@HyukjinKwon Thanks, I've resolved all you commented.

[HyukjinKwon]

@itholic, can you resolve conflicts and rebase this? I will merge.

[itholic]

@HyukjinKwon , Resolved conflicts. Thanks !

[softagram-bot]

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