Add dtrx package

packages/dtrx.rb

+require 'package'
+
+class Dtrx < Package
+  description "Intelligent archive extraction. dtrx stands for 'Do The Right Extraction.' It's a tool for Unix-like systems that takes all the hassle out of extracting archives."
+  homepage 'https://brettcsmith.org/2007/dtrx/'
+  version '7.1'
+  source_url 'https://brettcsmith.org/2007/dtrx/dtrx-7.1.tar.gz'
+  source_sha1 '05cfe705a04a8b84571b0a5647cd2648720791a4'
+
+  depends_on 'binutils'
+  depends_on 'bz2'
+  depends_on 'cabextract'
+  depends_on 'cpio'
+  depends_on 'lha'
+  depends_on 'python27'
+  depends_on 'unrar'
+  depends_on 'unshield'
+  depends_on 'unzip'
+
+  def self.install
+    system "python setup.py install --prefix=/usr/local"
+    system "mkdir -p #{CREW_DEST_DIR}/usr/local/bin"
+    system "cp /usr/local/bin/dtrx #{CREW_DEST_DIR}/usr/local/bin"
+  end
+end