Split bandwidth and rt plugins into separate files

This patch fixes #2

The core plugins no longer need to be in the boomerang.js file.  We hope
that at this point most people using boomerang have a build process
where they combine and minify their JavaScript, and this should be done
at that step.

The Makefile will by default include rt.js and bw.js, but this can be
overridden on the command line while running make.

Makefile

@@ -1,7 +1,7 @@
 # Copyright (c) 2011, Yahoo! Inc.  All rights reserved.
 # Copyrights licensed under the BSD License. See the accompanying LICENSE.txt file for terms.
 
-PLUGINS :=
+PLUGINS := rt.js bw.js
 
 VERSION := $(shell sed -ne '/^BOOMR\.version/{s/^.*"\([^"]*\)".*/\1/;p;q;}' boomerang.js)
 DATE := $(shell date +%s)
@@ -14,8 +14,8 @@ usage:
 	echo "Create a release version of boomerang:"
 	echo "	make"
 	echo ""
-	echo "Create a release version of boomerang with the dns plugin:"
-	echo "	make PLUGINS=dns.js"
+	echo "Create a release version of boomerang with the rt, bw & dns plugins:"
+	echo "	make PLUGINS=\"rt.js bw.js dns.js\""
 	echo ""
 	echo "Create a yuicompressor minified release version of boomerang:"
 	echo "	make MINIFIER=\"java -jar /path/to/yuicompressor-2.4.2.jar --type js\""