CI: move 3.4 build to mainstream / move 3.2 to experimental
API: Period should return NotImplemented as per the Python doc

if no comparison is implemented
Merge pull request #7379 from cpcloud/replace-no-match-7376

BUG: correct Period comparisons
TST/BUG: use BytesIO for Python 3.4 TestEncoding
Merge pull request #7388 from cpcloud/master

TST/BUG: use BytesIO for Python 3.4 TestEncoding
CLN: remove tox_prll in favor of detox [ci skip]
TST/BLD: update tox for py34 and add more deps and allow test args [ci skip]