Add docx2txt package

packages/docx2txt.rb

+require 'package'
+
+class Docx2txt < Package
+  description 'docx2txt is a perl based command line utility to convert Microsoft Office(Tm) Docx documents to equivalent Text documents.'
+  homepage 'http://docx2txt.sourceforge.net/'
+  version '1.4'
+  source_url 'http://downloads.sourceforge.net/project/docx2txt/docx2txt/v1.4/docx2txt-1.4.tgz'
+  source_sha256 'b297752910a404c1435e703d5aedb4571222bd759fa316c86ad8c8bbe58c6d1b'
+
+  def self.install
+    system "sed -i 's,/etc,#{CREW_PREFIX}/etc,' docx2txt.pl"
+    system "install -Dm644 docx2txt.config #{CREW_DEST_PREFIX}/etc/docx2txt.config"
+    system "install -Dm755 docx2txt.pl #{CREW_DEST_PREFIX}/bin/docx2txt.pl"
+    system "install -Dm755 docx2txt.sh #{CREW_DEST_PREFIX}/bin/docx2txt"
+  end
+end