* Fix build on Android

* Support for SSL_CIPHER

* RSA key material access
* Fix nightly warnings

* Add an RSA type

* Fix X.509 extension instability
* Add Nid::UserId

* Added ability to create RSA PKeys from PEM

* Make PKey Send, Sync, and Clone
* Add panic propagation of Stream errors via a nightly flag
* Fix double free issue in set_ssl_context
* Fix error reporting in connect and accept

* Actually depend on gdi32 and user32 on Windows.

* Prevent SslStream::{clone,try_clone} from crashing.

* Fix compilation on ARM

* Fix nonblocking SslStream behavior

* Fix build on ARM

* PBKDF2-HMAC-SHA256 and -SHA512 functions
* SNI support in SslStream
* A major rewrite of SslStream internals
    * read and write are now invoked directly on the wrapped stream with no
      intermediary buffering via a custom BIO.
    * NonblockingSslStream is deprecated in favor of SslStream::{ssl_read,
      ssl_write}
    * connect_generic and accept_generic are now equivalent to connect and
      accept
    * A new error type, ssl::Error, is returned from ssl_read and ssl_write,
      and will be the new return type of all other methods in the 0.8 release

* Don't pass empty include dir paths.

* Implement try_clone for MaybeSslStream<TcpStream>
* Fix a memory leak in EVP_PKEY_get1_RSA
* Remove unnecessary build dependency

* Expose RSA_generate_key_ex

* Support nonblocking streams
* Provide public_decrypt, private_encrypt for PKEY
* Put SslMethod::Sslv3 behind a feature gate
* Migrate SSL methods on SslStream to Ssl object, add getter to SslStream
* Split sys bindings requiring a C shim to another crate

* Add a method to read PEM formatted public keys

* Add a method to set the certificate chain file
* Add certs.pem to the probe search list
* Fix version checking in shim
* Output OpenSSL include dir from build script