Merge branch 'release-v0.6.5' into release

.travis.yml

README.md

openssl-sys/Cargo.toml

openssl-sys/build.rs

openssl-sys/src/lib.rs

openssl-sys/src/openssl_shim.c

openssl-sys/src/ssl_options.rs

openssl/Cargo.toml

openssl/src/crypto/mod.rs

openssl/src/crypto/pkcs5.rs

openssl/src/crypto/pkey.rs

openssl/src/crypto/symm.rs

openssl/src/crypto/symm_internal.rs

openssl/src/lib.rs

openssl/src/nid.rs

openssl/src/ssl/mod.rs

openssl/src/ssl/tests.rs

openssl/src/x509/extension.rs

openssl/src/x509/mod.rs

openssl/src/x509/tests.rs