* drop python 3.4 support

Our dependencies have started dropping support so it is becoming
difficult to test. Additionally, Python 3.4 represents <2% of our
downloads, so taking on a large maintenance burden to maintain support
isn't a good use of limited time. Accordingly, we're dropping testing
infrastructure and migrating our abi3 wheels to py35+.

* use removed instead of dropped

* Fixes #5018 -- break users on OpenSSL 1.0.1

* Grammar

* Syntax error

* Missing import

* Missing import

* PoC code for check PEM wrap

* Remove PoC check wrap code

* Add PEM file info to FAQ

* Add FAQ/PEM link in exception message

* Fix flake8 style issues

* refactor, update language

* it's really amazing how bad the spell checker is

* review feedback

* change to etc

* remove idna as a primary dependency

* empty commit

* dynamodb test fix (thanks to Matt Bullock)

* review feedback

* Fixes #4408 -- added an FAQ about abi3 wheels

* abi3 is a word, sort of

* Mention that PyCA also maintains pynacl

* line wrap

* add a faq entry for a message outdated pip/setuptools can output

* attention to detail is not my strong suit

* add a faq note about having a compiler that is too old

Also add a bit of text explaining what to do on OpenBSD 6.1 and earlier
since that is the most likely place this will occur.

* I always forget it spell checks titles