Use the https://cryptography.io domain name
Small fixups for the docs
Cleanup hash ctxs when we're done with them
Use more precise assertions
Merge pull request #152 from reaperhulk/openssl-evp-cipher-new-free

Use _new and _free methods on EVP_CIPHER_CTX
Merge pull request #150 from alex/cleanup-hash-ctx

Cleanup hash ctxs when we're done with them
Merge pull request #149 from alex/docs-fixups

Small fixups for the docs
Merge pull request #146 from dstufft/use-cryptography-io

Use the https://cryptography.io domain name
When copying a hash, pass the api through to the new object
add test to verify api is being copied in hash