Implement task evaluation feature

lib/producer/core/recipe.rb

@@ -13,11 +13,15 @@ module Producer
 
       def evaluate
         dsl = DSL.new(@code)
+        dsl.tasks.each.map(&:evaluate)
       end
 
 
       class DSL
+        attr_reader :tasks
+
         def initialize(code = nil, &block)
+          @tasks = []
           if code
             instance_eval code
           else
@@ -31,6 +35,10 @@ module Producer
         def source(filepath)
           instance_eval File.read("./#{filepath}.rb")
         end
+
+        def task(name, &block)
+          @tasks << Task.new(name, &block)
+        end
       end
     end
   end