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    # Renders an ERb template and returns the result. This is useful for
    # dynamically building documents to store on the remote servers.
    #
    # Usage:
    #
    #   render("something", :foo => "hello")
    #     look for "something.rhtml" in the current directory, or in the
    #     capistrano/recipes/templates directory, and render it with
    #     foo defined as a local variable with the value "hello".
    #
    #   render(:file => "something", :foo => "hello")
    #     same as above
    #
    #   render(:template => "<%= foo %> world", :foo => "hello")
    #     treat the given string as an ERb template and render it with
    #     the given hash of local variables active.
def render(*args)