jupyter: Add JUPYTER_CONFIG_DIR

IPYTHONDIR was usable for old versions of ipython, but since project was
renamed to Jupyter the environment variable is JUPYTER_CONFIG_DIR.

Ref:
http://jupyter.readthedocs.io/en/latest/projects/jupyter-directories.html#envvar-JUPYTER_CONFIG_DIR

software/ipython_notebook/instance.cfg.in

@@ -74,7 +74,9 @@ command-line =
 wrapper-path = ${directory:service}/ipython_notebook
 parameters-extra = true
 # Explicitly define IPython Directory to be used while starting ipython notebook
-environment = IPYTHONDIR=${directory:ipython_dir}
+environment =
+  IPYTHONDIR=${directory:ipython_dir}
+  JUPYTER_CONFIG_DIR=${directory:ipython_dir}
 
 [ipython-notebook-config]
 <= dynamic-jinja2-template-base

software/ipython_notebook/software.cfg

@@ -64,7 +64,7 @@ recipe = slapos.recipe.template:jinja2
 template = ${:_profile_base_location_}/instance.cfg.in
 rendered = ${buildout:directory}/template.cfg
 mode = 0644
-md5sum = b564e553811db272be681c331b270bbe
+md5sum = 43cfed9b2dde36265ed48211b42a70dd
 context =
   key bin_directory buildout:bin-directory
   key develop_eggs_directory buildout:develop-eggs-directory