Add apgdiff 1.4

apgdiff is a PostgreSQL schema diff tool.

Formula/apgdiff.rb

@@ -0,0 +1,19 @@
+require 'formula'
+
+class Apgdiff <Formula
+  url 'http://downloads.sourceforge.net/project/apgdiff/apgdiff/apgdiff-1.4/apgdiff-1.4-bin.zip'
+  homepage 'http://apgdiff.sourceforge.net/'
+  md5 '6ef287d02b4429d2111140f7fb2d8c29'
+
+  def startup_script
+<<-EOS
+#!/bin/bash
+java -jar "#{libexec}/apgdiff-1.4.jar" "$@"
+EOS
+  end
+
+  def install
+    libexec.install "apgdiff-1.4.jar"
+    (bin+'apgdiff').write startup_script
+  end
+end