BUG: fix Series.interpolate() corner cases, close #3674
Added documentation for to_clipboard()
Added a line about same retrieved content
ENH use pyperclip for read and to_clipboard
TST: Fix missing import in io/tests/test_json …

Nose import is missing. If you get to the error at the last line (under
urllib), python complains because nose is never imported.
Merge pull request #3855 from jtratner/patch-1

TST: Fix missing import in io/tests/test_json
TST slicing regression test
Merge pull request #3858 from hayd/TSTassign_subset

TST slicing regression test
CLN: avoid Unboundlocal error in tools/merge/_get_concatenaged_data (GH3833)
Merge pull request #3864 from jreback/concat_single_item

CLN: avoid Unboundlocal error in tools/merge/_get_concatenated_data (GH3833)
BLD: remove after_script since it does not exist anymore
ENH/CLN: add figsize kwargs to hist method
Merge pull request #3868 from cpcloud/remove-after-script

BLD: remove after_script.sh from travis since it does not exist anymore
Merge pull request #3842 from cpcloud/hist-figsize-3834

ENH: add figsize argument to DataFrame and Series hist methods
FIX: change initObjToJSON return type

This is necessary because clang complains about the return type. There's a call
to the macro import_array() which injects a return statement into wherever it's
used.
BUG: allow itertuples to work with duplicate columns
DOC: add release notes and bug fix notes
Merge pull request #3879 from cpcloud/itertuples-bug-3873

BUG: allow itertuples to work with frames with duplicate column names
ENH: do not convert mixed-integer type indexes to datetimeindex
DOC/TST: add test and release notes