BUG: fix erroneous call to prrint_thing -> pprint_thing
Merge pull request #4586 from cpcloud/fix-tony-the-tiger-pprint-call

BUG: fix erroneous call to prrint_thing -> pprint_thing
TST: fix ujson's intermittently failing date unit test
Merge pull request #4592 from Komnomnomnom/ujson-date-explosion

TST: fix ujson's intermittently failing date unit test
BUG: Fix boolean comparison with a DataFrame on the lhs, and a list/tuple on the rhs GH4576