Remove pyzmq adapter

Author: mrkn

lib/iruby/session_adapter.rb

@@ -40,14 +40,12 @@ def make_rep_socket(protocol, host, port)
 
     require_relative 'session_adapter/ffirzmq_adapter'
     require_relative 'session_adapter/cztop_adapter'
-    require_relative 'session_adapter/pyzmq_adapter'
     require_relative 'session_adapter/test_adapter'
 
     def self.select_adapter_class(name=nil)
       classes = {
         'ffi-rzmq' => SessionAdapter::FfirzmqAdapter,
         'cztop' => SessionAdapter::CztopAdapter,
-        # 'pyzmq' => SessionAdapter::PyzmqAdapter
         'test' => SessionAdapter::TestAdapter,
       }
       if (name ||= ENV.fetch('IRUBY_SESSION_ADAPTER', nil))