Allow third-party kernels to get additional args

This removes special treatment of IPython console so that other kernels can get command-line args. This doesn't allow the passing of flags, but does allow filenames, etc. Once this fix is in place, kernels can get these args via self.parent.extra_args

Author: Doug Blank

jupyter_client/consoleapp.py

@@ -285,10 +285,8 @@ def init_kernel_manager(self):
             self.exit(1)
 
         self.kernel_manager.client_factory = self.kernel_client_class
-        # FIXME: remove special treatment of IPython kernels
         kwargs = {}
-        if self.kernel_manager.ipykernel:
-            kwargs['extra_arguments'] = self.kernel_argv
+        kwargs['extra_arguments'] = self.kernel_argv
         self.kernel_manager.start_kernel(**kwargs)
         atexit.register(self.kernel_manager.cleanup_ipc_files)