Update build scripts

.gitignore

@@ -1,4 +1,3 @@
-index.html
 .*.sw[po]
 *.bak
 upload/

Makefile

@@ -1,10 +1,26 @@
+.PHONY: clean
 
-COMPILE_COMMAND = closure-compiler
+COMPILE_COMMAND ?= closure-compiler
+UPLOAD_DIR = upload
 
-JS_FILES = $(filter-out %.min.js, $(wildcard *.js))
-COMPILED_JS_FILES = $(JS_FILES:%.js=%.min.js)
+JS_FILES = $(wildcard *.js)
+COMPILED_JS_FILES = $(JS_FILES:%.js=$(UPLOAD_DIR)/%.min.js)
 
-%.min.js: %.js 
+INDEX_FILE = index.html
+
+all: $(UPLOAD_DIR) $(UPLOAD_DIR)/index.html $(COMPILED_JS_FILES) $(UPLOAD_DIR)/bootstrap.min.css
+
+$(UPLOAD_DIR)/%.min.js: %.js $(UPLOAD_DIR)
 	$(COMPILE_COMMAND) $< --js_output_file $@
 
-all: $(COMPILED_JS_FILES)
+$(UPLOAD_DIR)/index.html: $(INDEX_FILE) $(UPLOAD_DIR)
+	cp "$<" "$@"
+
+$(UPLOAD_DIR)/%.css: %.css
+	cp "$<" "$@"
+
+$(UPLOAD_DIR):
+	mkdir "$(UPLOAD_DIR)"
+
+clean:
+	@$(RM) -r $(UPLOAD_DIR)