added random_split in generic.py, for DataFrames etc.#11253

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lukovnikov wants to merge 5 commits intopandas-dev:masterfrom

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Commits on Oct 6, 2015

added random_split in generic.py, for DataFrames etc.
lukovnikov
committed
generalized to split(), with a randomness option, changed test
lukovnikov
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Commits on Oct 7, 2015

implemented optionally random splitting as Ordered/Random Grouper + .split() on a GroupBy
lukovnikov
committed
removed superfluous lines
lukovnikov
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Commits on Oct 8, 2015

improved code
lukovnikov
committed