* allow bytearrays for key/iv for symmetric encryption

* bump pypy/cffi requirements

* update docs, fix some tests

* old openssl is naught but pain

* revert a typo

* use trusty for old pypy

* better error msg again

* restore match

* Update docs and changelog for URI, RFC822Name, and DNSName

As of 2.1 we want users to pass A-label strings, but we still accept
U-label strings and auto-encode on their behalf (with a deprecation
warning). However, we do not return U-label in the value attribute so
we are making a backwards incompatible change for users that utilize
internationalized domain names.

* language updates

* add presentational to the word list

* the linux dictionary is pathetic

* doc the relationship between PrivateKey and PrivateKeyWithSerialization

Or at least do it better.

* let's talk about opaque keys