Add aws_shell package

packages/aws_shell.rb

+require 'package'
+
+class Aws_shell < Package
+  description 'An integrated shell for working with the AWS CLI.'
+  homepage 'https://github.com/awslabs/aws-shell'
+  version '0.2.0'
+  source_url 'https://github.com/awslabs/aws-shell/archive/0.2.0.tar.gz'
+  source_sha256 '6d3a333c13c6c4cd3b9f1316a0a0c53ce4807b673dba63882ab2f834c2ffb903'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'python27' unless File.exists? "#{CREW_PREFIX}/bin/python"
+
+  def self.install
+    system "yes | pip install setuptools"
+    system "python setup.py install --prefix #{CREW_PREFIX} --root #{CREW_DEST_DIR}"
+    system "pip uninstall setuptools"
+  end
+end