Some renderer changes
	modified:   src/renderer/SimpleExceptionRenderer.java
	modified:   src/servlet/Servlet.java
	build.xml
	src/annotation/response/JSONRenderer.java
	src/annotation/response/formatter/
	src/renderer/DirectoryServer.java
	src/renderer/JSONResponseRenderer.java
	src/util/
	test/annotation/response/JSONRendererTest.java
	test/annotation/response/formatter/
	test/renderer/
	test/util/