* fix from_issuer_subject_key_identifier to take the right type

deprecate passing the old Extension wrapper object

* don't use a try:except:

* hilarious contortions to satisfy doc8

* test: regression test for UnicodeEncodeError in x509 name in #4810

added utf8 encoding at the top of the file due to PEP 263

* bugfix: #4810 resolve UnicodeEncodeError in x509 name

* fix a memory leak in AIA parsing

* oops can't remove that

* fix != comparison in py2 (fixes #4821)

* remove blank line b/c pep8

* move __ne__ next to __eq__ as per review request

we don't support ed448 openssh keys so we'll use that to test this
branch. if we ever do support ed448 keys we can always just call this
private method directly to keep coverage.

* add OpenSSH serialization for ed25519 keys (#4808)

* address review comments

* poly1305 support

* some more tests

* have I mentioned how bad the spellchecker is?

* doc improvements

* EVP_PKEY_new_raw_private_key copies the key but that's not documented

Let's assume that might change and be very defensive

* review feedback

* add a test that fails on a tag of the correct length but wrong value

* docs improvements