Log Message:
Updated py-idna to 2.2.

2.2 (2016-12-21)
++++++++++++++++

- Made some changes to the UTS 46 data that should allow Jython to get around
  64kb Java class limits. (Thanks, John A. Booth and Marcin Płonka.)
- In Python 2.6, skip two tests that rely on data not present in that
  Python version's unicodedata module.
- Use relative imports to help downstream users.