Merge branch 'jhub-integration' of https://github.com/blink1073/jupyt…

…erlab into jhub-integration

jupyterlab/labhubapp.py

@@ -12,7 +12,19 @@
     raise ImportError('You must have jupyterhub installed for this to work.')
 else:
     class SingleUserLabApp(SingleUserNotebookApp, LabApp):
-
+        """
+        A sublcass of JupyterHub's SingleUserNotebookApp which includes LabApp
+        as a mixin. This makes the LabApp configurables available to the spawned
+        jupyter server.
+
+        If you don't need to change any of the configurables from their default
+        values, then this class is not necessary, and you can deploy JupyterLab
+        by ensuring that its server extension is enabled and setting the
+        `Spawner.default_url` to '/lab'.
+
+        If you do need to configure JupyterLab, then use this application by
+        setting `Spawner.cmd = ['jupyter-labhub']`.
+        """
         @default("default_url")
         def _default_url(self):
             """when using jupyter-labhub, jupyterlab is default ui"""