added rendering script for artwork

art/render.rb

@@ -0,0 +1,12 @@
+#!/bin/env ruby
+resolutions={'mdpi'=> 1, 'hdpi' => 1.5, 'xhdpi' => 2, 'xxhdpi' => 3}
+images = { 'conversations.svg' => ['ic_launcher',48], 'conversations_baloon.svg' => ['ic_activity', 32], 'conversations_mono.svg' => ['ic_notification',24] }
+images.each do |source, result|
+	resolutions.each do |name, factor|
+		size = factor * result[1]
+		path = "../res/drawable-#{name}/#{result[0]}.png"
+		cmd = "inkscape -e #{path} -C -h #{size} -w #{size} #{source}"
+		puts cmd
+		system cmd
+	end
+end