unification of meta-attributes handling: * remove has_format, has_text_encoding, format, text_encoding methods on Entity * remove rich_text_fields method on EntitySchema * use instead has_metadata / meta_attribute on EntitySchema (from yams) and attribute_metadata on Entity

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class RepoThread(object):

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    def __init__(self, *args):

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        pass # XXX raise

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    def start(self):

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        pass

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    def join(self):

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        pass

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class LoopTask(RepoThread):

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    def cancel(self):

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        pass