Add clean package

packages/clean.rb

+require 'package'
+
+class Clean < Package
+  description 'Clean is a program that searches for files identified by regular expressions and deletes them'
+  homepage 'https://sourceforge.net/projects/clean/'
+  version '3.4'
+  source_url 'http://downloads.sourceforge.net/project/clean/clean/3.4/clean-3.4.tar.bz2'
+  source_sha256 '761f3a9e1ed50747b6a62a8113fa362a7cc74d359ac6e8e30ba6b30d59115320'
+
+  def self.build
+    system "make"
+  end
+
+  def self.install
+    system "install -Dm755 -s clean #{CREW_DEST_PREFIX}/bin/clean"
+    system "install -Dm644 clean.1 #{CREW_DEST_PREFIX}/share/man/man1/clean.1"
+  end
+end