Add the composer.json and composer.lock files.
Ignore the vendor/ and bin/ directories.

The vendor/ and bin/ directories are both created by Composer.
Add the Thrift\Transport\TZmqTransport class.

 * Very nearly almost copy the Python TZmqClient class at
   https://github.com/apache/thrift/blob/master/contrib/zeromq/TZmqClient.py#L23