add implementation and implementation_version to kernel_info_reply

IPython/kernel/tests/test_message_spec.py

@@ -142,9 +142,11 b' class CompleteReply(Reference):'
 
 class KernelInfoReply(Reference):
     protocol_version = Version('5.0')
-    ipython_version = Version('2.0')
+    implementation = Unicode('ipython')
+    implementation_version = Version('2.1')
     language_version = Version('2.7')
-    language = Unicode()
+    language = Unicode('python')
+    banner = Unicode()
 
 
 # IOPub messages

IPython/kernel/zmq/ipkernel.py

@@ -572,7 +572,8 b' class Kernel(Configurable):'
     def kernel_info_request(self, stream, ident, parent):
         vinfo = {
             'protocol_version': protocol_version,
-            'ipython_version': ipython_version,
+            'implementation': 'ipython',
+            'implementation_version': ipython_version,
             'language_version': language_version,
             'language': 'python',
             'banner': self.shell.banner,