Modifies source/Makefile in order to:

- Adds new 'py' directive with Bash script
- Adds same Bash script under json directive
- Invoke child Makefile in /scripts/_python
- Execute bundle_lister.py
- Provide 'py' directive for future Python scripts

Signed-off-by: Michael Vincerra <michael.vincerra@intel.com>

source/Makefile

@@ -6,6 +6,7 @@ SPHINXOPTS    =
 SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = _build
+SCRIPTDIR     = scripts/_python
 
 # User-friendly check for sphinx-build
 ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
@@ -56,6 +57,9 @@ html:
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
 
+py:
+	$(MAKE) -C $(SCRIPTDIR) py
+
 dirhtml:
 	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
 	@echo
@@ -73,6 +77,7 @@ pickle:
 
 json:
 	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	$(MAKE) -C $(SCRIPTDIR) py
 	@echo
 	@echo "Build finished; now you can process the JSON files."