Add Makefile for automatic compile JavaScript

Makefile

@@ -0,0 +1,10 @@
+
+COMPILE_COMMAND = closure-compiler
+
+JS_FILES = $(filter-out %.min.js, $(wildcard *.js))
+COMPILED_JS_FILES = $(JS_FILES:%.js=%.min.js)
+
+%.min.js: $(JS_FILES)
+	$(COMPILE_COMMAND) $< --js_output_file $@
+
+all: $(COMPILED_JS_FILES)