Merge branch 'release-v0.7.6' into release

README.md

appveyor.yml

openssl-sys-extras/Cargo.toml

openssl-sys-extras/src/lib.rs

openssl-sys-extras/src/openssl_shim.c

openssl-sys/Cargo.toml

openssl-sys/src/lib.rs

openssl/Cargo.toml

openssl/src/bn/mod.rs

openssl/src/crypto/mod.rs

openssl/src/crypto/pkey.rs

openssl/src/crypto/rsa.rs

openssl/src/lib.rs

openssl/src/nid.rs

openssl/src/ssl/tests/mod.rs

openssl/src/x509/mod.rs

openssl/src/x509/tests.rs

openssl/test/build.sh

openssl/test/nid_uid_test_cert.pem