adjust timezone when adding date offsets for DST. fixes #5175
BUG: Fix for to_excel +/- infinity

Previously, a negative sign was being prepended to positive infinite
values and was absent for negative infinity. (GH6812)

TST: assert_almost_equals() checks +/- infinity

The existing ``test_inf_roundtrip`` should have caught this bug, but
the underlying ``assert_almost_equal`` was not checking that the two
given values were both positive or negative.
BUG/API: Previously an enlargement with a mixed-dtype frame would act unlike .append which will preserve dtypes (related GH2578, GH8176)
Merge pull request #8176 from jreback/expand

BUG/API: Previously an enlargement with a mixed-dtype frame would act unlike append (related GH2578)
Merge branch 'excel-infinity-fix' of https://github.com/maxchang/pandas into maxchang-excel-infinity-fix
Merge branch 'dst-date-offset' of https://github.com/adamgreenhall/pandas into adamgreenhall-dst-date-offset

Conflicts:
	doc/source/v0.15.0.txt
DOC: added release note, this fixes #8173
Merge pull request #8179 from mortada/nth_values_notes

DOC: added release note, this fixes #8173
BUG: scatter with errorbar raises IndexError
Merge pull request #8183 from sinhrks/scatter_error

BUG: scatter with errorbar raises IndexError
API: kdeplot fails with NaNs

Test cases for kde with missing vals

Drop na values before creating kde

Add to the release notes
Merge pull request #8196 from onesandzeroes/kde-na

API: kdeplot fails with NaNs.
counting sort instead of np.argsort in left outer join
BUG: GroupBy.count() with float32 data type does not exclude nan
Merge pull request #8171 from behzadnouri/count-f32

BUG: GroupBy.count() with float32 data type does not exclude nan
Merge pull request #8172 from behzadnouri/lj-cnt-sort

counting sort instead of np.argsort in left outer join
BUG: barplot with NaNs
DOC: Table about how plots handle missing data.
Merge pull request #8177 from TomAugspurger/barplot-NaN

BUG: barplot with NaNs
BUG: Fix Grouper with multi-level index and frequency (GH7885)