BUG: fix broken BigqueryError reference
CLN: remove docstrings from a handful of tests for consistency and nose -v output
BLD: travis, run nose with -v for more visibility
Merge pull request #6110 from y-p/PR_test_cleanups

CLN: Eliminate handful of test docstrings, use nose -v on travis
TST: add tests for old version of numexpr
BLD/CI: add numexpr==1.4.2 to build wheels
CLN/TST: DRY skip_if_no_ne
Replace network decorator with with_connectivity_check

Network decorator was ignoring test failures due to API changes in
external services.
Merge pull request #6109 from cpcloud/ne-version

TST: add tests for old version of numexpr
BLD: enable Machine field in print_versions
BLD: enable Machine field in print_versions
BLD: travis, run nose with -v. again.
TST: HTMLFormatter does not die on unicode frame GH6098
BUG: HTMLFormatter does not die on unicode frame GH6098
Merge pull request #6112 from y-p/PR_GH6098

BUG: HTMLFormatter does not die on unicode frame GH6098
TST: get_options_data ValueError if given only one of month/year GH6105
BUG: get_options_data should raise ValueError if given only one of month/year GH6105
Merge pull request #6114 from y-p/PR_GH6105

BUG: get_options_data should validate it's arguments GH6105
TST: add _skip_if_no_xlrd() to test GH5583
Merge pull request #6115 from y-p/PR_GH5583_fix_skip

TST: add _skip_if_no_xlrd() to test GH5583