Implement remove and dependencies setting in Ruby

lib/package.rb

@@ -2,4 +2,15 @@ require './lib/package_helpers'
 
 class Package
   property :version, :binary_url, :binary_sha1, :source_url
+  
+  class << self
+    attr_reader :dependencies
+  end
+  def self.depends_on (dependency = nil)
+    @dependencies = [] unless @dependencies
+    if dependency
+      @dependencies << dependency
+    end
+    @dependencies
+  end
 end