Add Redis 3.0.6

packages/redis.rb

+require 'package'
+
+class Redis < Package
+  version '3.0.6'
+  source_url 'http://download.redis.io/releases/redis-3.0.6.tar.gz'
+  source_sha1 '4b1c7b1201984bca8f7f9c6c58862f6928cf0a25'
+
+  depends_on 'buildessential'
+
+  def self.build
+    system "CC='gcc' make"
+  end
+
+  def self.install
+    system "make", "PREFIX=#{CREW_DEST_DIR}/usr/local", "install"
+    puts "-----------------"
+    puts "Installation success!"
+    puts "To start the redis server: redis-server --daemonize yes"
+    puts "To connect to the server: redis-cli"
+  end
+end