CI: use nose-show-skipped plugin to show skipped tests
CLN: remove print_skipped.py
CI: freeze the showskipped commit
DOC: minor release/v0.13 corrections
Merge pull request #5072 from cpcloud/travis-nose-skipped

CI/ENH: use nose-show-skipped plugin to show skipped tests
Fix order of index methods
Merge pull request #5081 from jtratner/fix-order-of-index-methods

CLN: Fix order of index methods.
API: default export for to_clipboard is now csv (GH3368)