Add libuv (1.9.1) package

libuv is a multi-platform support library with a focus on asynchronous
I/O.

Tested as working on Samsung XE50013-K01US.

packages/libuv.rb

+require 'package'
+
+class Libuv < Package
+  version '1.9.1'
+  source_url 'http://dist.libuv.org/dist/v1.9.1/libuv-v1.9.1.tar.gz'
+  source_sha1 '668d636372e3276aecc6082082a86f86ddb67877'
+
+  depends_on 'glibc'
+
+  def self.build
+    system './autogen.sh'
+    system './configure --prefix=/usr/local'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install" 
+  end
+end