* `DataFrame.slice_off`: New method * `GeoJSON.to_data_frame`: New method * Fix error with new column placeholder attributes in conjunction with pop, popitem and clear
0.37
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* `DataFrame`: Add placeholder attributes for columns so that tab completion of columns as attributes at a shell works * `dt.from_string`: New function * `dt.to_string`: New function * `nrow`: Remove deprecated aggregation function * Don't use Numba for aggregation involving strings due to bad performance
0.36
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* `dt`: New module for dealing with dates and datetimes
0.35
=========================
* `DataFrame.from_pandas`: Speed up by avoiding unnecessary conversions * `DataFrame.full_join`: Fix join and output when `by` is a tuple * `GeoJSON`: Fix printing object