Add support for iojs v2.1.0

packages/iojs.rb

+require 'package'
+
+class Iojs < Package
+  version '2.1.0'
+  source_url 'https://iojs.org/dist/v2.1.0/iojs-v2.1.0.tar.gz'
+  source_sha1 '3236518f6e16334d0ed4c40b075625a0bb04086d'
+
+  depends_on 'buildessential'
+  depends_on 'python27'
+
+  def self.build
+    # These are needed for iojs to install
+    system "sudo ln -s /usr/local/bin/gcc /usr/local/bin/cc"
+
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end