ENH/BUG: Period and PeriodIndex ops supports timedelta-like
BUG: fix transform with integers
Merge pull request #7973 from cpcloud/transform-oddity-7972

BUG: fix transform with integers
PERF: perf improvements for Series.transform (revised) (GH6496)
Merge pull request #7975 from jreback/transform_perf

PERF: perf improvements for Series.transform (revised) (GH6496)
BUG: Allow __name__less callables as groupby hows (GH7929)
Merge pull request #7974 from dsm054/allow_nameless_callables

BUG: Allow __name__less callables as groupby hows (GH7929)
INT: use platform_int for np.repeat related (GH7975)
Merge pull request #7966 from sinhrks/period_delta

ENH/BUG: Period and PeriodIndex ops supports timedelta-like
API: add Series.dt delegator for datetimelike methods (GH7207)

CLN: make _add_delegate_accessors generic
Merge pull request #7953 from jreback/dt

API: add Series.dt delegator for datetimelike methods (GH7207)
added `meminfo()` method; changed `info()` behavior.

Method added to get memory usage of DataFrame colums and `df.info()` changed to show total memory usage of the DataFrame.
Added/edited docstrings.
Retooled memory_usage implementation.

DataFrame `memory_usage` automatically displays units and `meminfo` returns memory usage of each column in bytes. This follows the discussion found here <https://github.com/pydata/pandas/issues/6852>.
Fixed typo.
Added `test_info_memory_usage`

Tests whether "memory usage: " is displayed in from `df.info(memory_usage=True)` when `memory_usage` keyword is asserted.
Added memory usage (Issue #6852) to enhancements list.
Added memory usage example.
Moved API example to v0.15.0 documentation.
Resolved conflict in memory usage example.