Added makefile for building the compressed files

git-svn-id: https://flot.googlecode.com/svn/trunk@224 1e0a6537-2640-0410-bfb7-f154510ff394

Makefile

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+# Makefile for generating minified files
+
+YUICOMPRESSOR_PATH=../yuicompressor-2.3.5.jar
+
+# if you need another compressor path, just copy the above line to a
+# file called Makefile.local, customize it and you're good to go
+-include Makefile.local
+
+.PHONY: all
+
+# we cheat and process all .js files instead of listing them
+all: $(patsubst %.js,%.min.js,$(filter-out %.min.js,$(wildcard *.js)))
+
+%.min.js: %.js
+	java -jar $(YUICOMPRESSOR_PATH) $< -o $@