add go_bootstrap package

packages/go_bootstrap.rb

+require 'package'
+
+class Go_bootstrap < Package
+  version '1.4'
+  source_url 'https://storage.googleapis.com/golang/go1.4-bootstrap-20161024.tar.gz'
+  source_sha1 '47e02e41aa99dea899b65ebf7b50ec706141be8c'
+
+  def self.build
+    FileUtils.cd('src') do
+      system "TMPDIR=/usr/local/tmp ./make.bash"
+    end
+  end
+
+  def self.install
+    dest = "#{CREW_DEST_DIR}/usr/local/lib/go_bootstrap"
+    system "mkdir", "-p", dest
+    FileUtils.mv Dir.pwd, dest
+    
+    puts "--------"
+    puts "Installed Go_bootstrap for linux/amd64 in /usr/local/lib/go_bootstrap"
+  end
+end
\ No newline at end of file