use notebook-dir as cwd for kernels

IPython/frontend/html/notebook/handlers.py

@@ -330,8 +330,9 b' class MainKernelHandler(AuthenticatedHandler):'
     @web.authenticated
     def post(self):
         km = self.application.kernel_manager
+        nbm = self.application.notebook_manager
         notebook_id = self.get_argument('notebook', default=None)
-        kernel_id = km.start_kernel(notebook_id)
+        kernel_id = km.start_kernel(notebook_id, cwd=nbm.notebook_dir)
         data = {'ws_url':self.ws_url,'kernel_id':kernel_id}
         self.set_header('Location', '/'+kernel_id)
         self.finish(jsonapi.dumps(data))

IPython/frontend/html/notebook/kernelmanager.py

@@ -245,7 +245,7 b' class MappingKernelManager(MultiKernelManager):'
         if notebook_id is not None:
             del self._notebook_mapping[notebook_id]
 
-    def start_kernel(self, notebook_id=None):
+    def start_kernel(self, notebook_id=None, **kwargs):
         """Start a kernel for a notebok an return its kernel_id.
 
         Parameters
@@ -257,7 +257,6 b' class MappingKernelManager(MultiKernelManager):'
         """
         kernel_id = self.kernel_for_notebook(notebook_id)
         if kernel_id is None:
-            kwargs = dict()
             kwargs['extra_arguments'] = self.kernel_argv
             kernel_id = super(MappingKernelManager, self).start_kernel(**kwargs)
             self.set_kernel_for_notebook(notebook_id, kernel_id)

IPython/frontend/html/notebook/notebookapp.py

@@ -407,7 +407,6 b' class NotebookApp(BaseIPythonApplication):'
     def init_configurables(self):
         # force Session default to be secure
         default_secure(self.config)
-        # Create a KernelManager and start a kernel.
         self.kernel_manager = MappingKernelManager(
             config=self.config, log=self.log, kernel_argv=self.kernel_argv,
             connection_dir = self.profile_dir.security_dir,