Add aspell package

packages/aspell.rb

+require 'package'
+
+class Aspell < Package
+  description 'GNU Aspell is a Free and Open Source spell checker designed to eventually replace Ispell.'
+  homepage 'http://aspell.net/'
+  version '0.60.7-rc1'
+  source_url 'ftp://alpha.gnu.org/gnu/aspell/aspell-0.60.7-rc1.tar.gz'
+  source_sha1 '65d4bd8c2e9f8455344d22805d6e135706a69bdd'
+  #source_sha256 '86b5662f24316142f70c5890787bdc5596625ca3604dfe85926ee61f27f2365e'
+
+  depends_on 'ruby' unless File.exists? '/usr/local/bin/ruby'
+
+  def self.build
+    system './configure'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end