Add missing support file for override_task
user
```ruby
# from http://metaskills.net/2010/05/26/the-alias_method_chain-of-rake-override-rake-task/
Rake::TaskManager.class_eval do
  def alias_task(fq_name)
    new_name = "#{fq_name}:original"
    @tasks[new_name] = @tasks.delete(fq_name)
  end
end

def alias_task(fq_name)
  Rake.application.alias_task(fq_name)
end

def override_task(*args, &block)
  name, params, deps = Rake.application.resolve_args(args.dup)
  fq_name = Rake.application.instance_variable_get(:@scope).dup.push(name).join(':')
  alias_task(fq_name)
  Rake::Task.define_task(*args, &block)
end
```
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