Add available versions to generated package list documentation.

lib/spack/docs/Makefile

@@ -42,12 +42,14 @@ gh-pages: _build/html
 	touch .nojekyll && \
 	git init && \
 	git add . && \
-	git commit -m "Initial commit" && \
+	git commit -m "Spack Documentation" && \
 	git push -f $$root master:gh-pages && \
 	rm -rf .git
 
 upload:
 	rsync -avz --rsh=ssh --delete _build/html/ cab:/usr/global/web-pages/lc/www/adept/docs/spack
+	git push -f origin gh-pages
+	git push -f github gh-pages
 
 apidoc:
 	sphinx-apidoc -T -o . $(PYTHONPATH)/spack