Restore ipkernel module

IPython/kernel/zmq/ipkernel.py

@@ -0,0 +1,4 b''
+from .kernelbase import KernelBase
+
+class Kernel(KernelBase):
+    pass
  No newline at end of file

IPython/kernel/zmq/kernelbase.py

@@ -47,7 +47,7 b' ipython_version = release.version'
 language_version = sys.version.split()[0]
 
 
-class Kernel(Configurable):
+class KernelBase(Configurable):
 
     #---------------------------------------------------------------------------
     # Kernel interface
@@ -137,7 +137,7 b' class Kernel(Configurable):'
 
 
     def __init__(self, **kwargs):
-        super(Kernel, self).__init__(**kwargs)
+        super(KernelBase, self).__init__(**kwargs)
 
         # Initialize the InteractiveShell subclass
         self.shell = self.shell_class.instance(parent=self,