implements DataFrame#reset_index #473
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reset_index will change index into columns.
Refer: https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reset_index.html
To implement this method,
Index#to_dfandMultiIndex#to_dfwas also defined. Since pandas also have such method, I think we can get benefits by implementing such method.refer: https://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.MultiIndex.to_frame.html#pandas.MultiIndex.to_frame