Add Makefile that makes it able to test babel with current babylon

.gitignore

@@ -1,2 +1,3 @@
+build
 lib
 node_modules

Makefile

@@ -0,0 +1,20 @@
+MAKEFLAGS = -j1
+
+export NODE_ENV = test
+
+.PHONY: make clean test test-only test-cov test-clean test-travis publish build bootstrap publish-core publish-runtime build-website build-core watch-core build-core-test clean-core prepublish
+
+clean: ; rm -rf ./build
+
+bootstrap-babel: clean
+	mkdir ./build
+	git clone git@github.com:babel/babel.git ./build/babel
+	cd ./build/babel; \
+	make bootstrap
+	find ./build/babel/packages -type d -name 'babylon' -prune -exec rm -rf '{}' \; -exec ln -s '../../../../../' '{}' \;
+
+test-babel:
+	npm run build
+	cd ./build/babel; \
+	make test-only
+