Merge branch 'master' into staging-next

Comments on conflicts:
- llvm: d6f401e1 vs. 469ecc70 - docs for 6 and 7 say the default is
  to build all targets, so we should be fine
- some pypi hashes: they were equivalent, just base16 vs. base32

pkgs/development/python-modules/cryptography/default.nix

@@ -66,4 +66,18 @@ buildPythonPackage rec {
   # IOKit's dependencies are inconsistent between OSX versions, so this is the best we
   # can do until nix 1.11's release
   __impureHostDeps = [ "/usr/lib" ];
+
+  meta = with stdenv.lib; {
+    description = "A package which provides cryptographic recipes and primitives";
+    longDescription = ''
+      Cryptography includes both high level recipes and low level interfaces to
+      common cryptographic algorithms such as symmetric ciphers, message
+      digests, and key derivation functions.
+      Our goal is for it to be your "cryptographic standard library". It
+      supports Python 2.7, Python 3.4+, and PyPy 5.3+.
+    '';
+    homepage = https://github.com/pyca/cryptography;
+    license = with licenses; [ asl20 bsd3 psfl ];
+    maintainers = with maintainers; [ primeos ];
+  };
 }