Drop 1.0.0 (#3312)

* delete the 1.0.0 support

* drop the version check

* drop the AES-CTR stuff

* Update the example

* openssl truncates for us now

* delete unused test

* unused imports

* Remove a bunch of conditional bindings for NPN

* no more 1.0.0 builders

* libressl fix

* update the docs

* remove dead branches

* oops

* this is a word, damnit

* spelling

* try removing this

* this test is not needed

* unused import
diff --git a/docs/faq.rst b/docs/faq.rst
index 76117a9..bbcf302 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -40,27 +40,14 @@
 appear to be at fault, it's possible that this is a bug in ``cryptography``.
 Please file an `issue`_ with instructions on how to reproduce it.
 
-Importing cryptography causes a ``RuntimeError`` about OpenSSL 1.0.0
---------------------------------------------------------------------
+Installing cryptography with OpenSSL 0.9.8 or 1.0.0 fails
+---------------------------------------------------------
 
-The OpenSSL project has dropped support for the 1.0.0 release series. Since it
-is no longer receiving security patches from upstream, ``cryptography`` is also
-dropping support for it. To fix this issue you should upgrade to a newer
-version of OpenSSL (1.0.1 or later). This may require you to upgrade to a newer
-operating system.
-
-For the 1.7 release, you can set the ``CRYPTOGRAPHY_ALLOW_OPENSSL_100``
-environment variable. Please note that this is *temporary* and will be removed
-in ``cryptography`` 1.8.
-
-Installing cryptography with OpenSSL 0.9.8 fails
-------------------------------------------------
-
-The OpenSSL project has dropped support for the 0.9.8 release series. Since it
-is no longer receiving security patches from upstream, ``cryptography`` is also
-dropping support for it. To fix this issue you should upgrade to a newer
-version of OpenSSL (1.0.1 or later). This may require you to upgrade to a newer
-operating system.
+The OpenSSL project has dropped support for the 0.9.8 and 1.0.0 release series.
+Since they are no longer receiving security patches from upstream,
+``cryptography`` is also dropping support for them. To fix this issue you
+should upgrade to a newer version of OpenSSL (1.0.1 or later). This may require
+you to upgrade to a newer operating system.
 
 .. _`NaCl`: https://nacl.cr.yp.to/
 .. _`PyNaCl`: https://pynacl.readthedocs.io