TST: fix intermittent dict_complex test failures

`test_dict_complex` and `test_dict_numpy_complex` would give occasional
test failures on Python 3.4.  The test was written to depend on the
order of values from `dict.values()`; remove that dependency.

Closes gh-7293.
Merge pull request #7298 from matthew-brett/fix-dict-complex-failures

TST: fix intermittent dict_complex test failures
BUG: Index.delete doesnt preserve name and other attrs
CLN/TST Remove compat.scipy
Merge pull request #7296 from clham/CompatScipy

CLN/TST remove compat.scipy
Update CONTRIBUTING.md

mention pep8radius
TST: missing import of nose in test_tseries.py
Merge pull request #7302 from sinhrks/delete

BUG: Index.delete doesnt preserve name and other attrs
BUG: do not remove temporaries from eval/query scope
Merge pull request #7303 from cpcloud/eval-local-string-fix-7300

BUG: do not remove temporaries from eval/query scope
BUG: allow dup indexing with Float64Index
Merge pull request #7149 from cpcloud/float64index-dup-fix-7143

BUG: allow dup indexing with Float64Index
TST/ERR: raise a ValueError at runtime for incompatible versions of openpyxl

instead of warning at import time

add openpyxl 2.0.3 to trigger travis fails on import
Merge pull request #7285 from cpcloud/openpyxl-format-string-fix-7284

BUG/CI/TST: fix format strings
BUG: BoolBlock shouldn't replace truthy values
ENH/TST: add anonymous reading of s3 for public buckets
Merge pull request #7304 from cpcloud/fix-replace-bool-yet-again-7140

BUG: replace() alters unrelated values
BUG/TST: should skip openpyxl before testing version compat
Merge pull request #7281 from cpcloud/public-s3-7246

ENH/TST: add anonymous reading of s3 for public buckets
Merge pull request #7311 from cpcloud/openpyxl-format-string-fix-7284

BUG/TST: should skip openpyxl before testing version compat