Merge pull request #5119 from jtratner/remove-test_py

CLN: Remove leftover test.py file
CLN: Cleanup Int64Index and Float64Index __new__

Int64Index had duplicate code under a branch plus both were looking for
scalar data errors handled in `_coerce_to_ndarray` anyways.
Merge pull request #5117 from jtratner/cleanup-int64index-constructor

CLN: Remove redundant initialization from Int64Index and Float64Index constructor
CLN: clean up parser options

Also add a test to make sure that the C parser options validation is actually
covered
CLN: remove factorize argument
Merge pull request #5121 from cpcloud/parser-options-mania

CLN: clean up parser options
TST: Tests and fix for unhandled data types in Excel writers.

Added tests and a fix for unhandled numpy data types in the
Excel writers. Issue #3122.
BUG: set_names should not change is_ relationship
Merge pull request #5132 from jtratner/fix-set-names-error

BUG: set_names should not change is_ relationship
BUG: Treat a list/ndarray identically for iloc indexing with list-like (GH5006)
Merge pull request #5134 from jreback/list_index

BUG: Treat a list/ndarray identically for iloc indexing with list-like (GH5006)
ENH: Json support for datetime.time
ENH: json default_handler param
Merge pull request #5137 from Komnomnomnom/json-time-suport

ENH: Json support for datetime.time
Merge branch 'json-default-handler' of https://github.com/Komnomnomnom/pandas into Komnomnomnom-json-default-handler
TST: fillna(values) equiv of replace(np.nan,values)
Merge pull request #5139 from jreback/fillna_string

TST: fillna(values) equiv of replace(np.nan,values)
BUG: MultiIndex.get_level_values() replaces NA by another value (#5074)
Make _na_value a class attribute.
Merge pull request #5090 from goyodiaz/multiindex-nan

BUG: MultiIndex.get_level_values() replaces NA by another value (#5074)