update buildout

component/jupyter_renderjs/buildout.cfg

 [buildout]
 parts =
-  jupyter-pip
   renderjs_nbextension
 
-
-[jupyter-pip]
-recipe = zc.recipe.egg:custom
-egg = jupyter-pip
-
-# renderjs_nbextension installed from latest git version
 [renderjs_nbextension]
 recipe = zc.recipe.egg:develop
 egg = renderjs_nbextension
 setup = ${renderjs_nbextension-submoduleinit:location}/renderjs_nbextension
+setup-eggs = jupyter-pip
+environment = renderjs_nbextension-env
 
+[renderjs_nbextension-env]
+PATH = ${git:location}/bin:%(PATH)s
 
 [renderjs_nbextension-repository]
 recipe  = slapos.recipe.build:gitclone
 repository = https://lab.nexedi.com/Kreisel/renderjs_extension.git
-# dir is pretty name as top-level -dev recipe
 location = ${buildout:parts-directory}/renderjs_nbextension
-git-executable = /sbin/git
+git-executable = ${git:location}/bin/git
 
 
-# TODO add `git clone --recursive` to slapos.recipe.build:gitclone
-#      and this way merge this -submoduleinit into -repository part
 [renderjs_nbextension-submoduleinit]
 recipe = plone.recipe.command
-command = cd "${renderjs_nbextension-repository:location}" && /sbin/git submodule update --init
+command = cd "${renderjs_nbextension-repository:location}" && ${git:location}/bin/git submodule update --init
 stop-on-error = true
-# propagate location of main repo
-location= ${renderjs_nbextension-repository:location}
+location= ${renderjs_nbextension-repository:location}
\ No newline at end of file