class Rake::FileCreationTask


any rebuilds of tasks that depend on it whenever it is updated.
not re-triggered if any of its dependencies are newer, nor does trigger
needed if and only if the file has not been created. Once created, it is
A FileCreationTask is a file task that when used as a dependency will be
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def needed?

Is this file task needed? Yes if it doesn't exist. 
def needed?
  ! File.exist?(name)
end

def timestamp

than any other time stamp.
Time stamp for file creation task. This time stamp is earlier 
def timestamp
  Rake::EARLY
end