Append an object to end. If the object is a string, appends a
    :class:`Word <Word>` object.

def append(self, obj):
    """Append an object to end. If the object is a string, appends a
    :class:`Word <Word>` object.
    """
    if isinstance(obj, basestring):
        return self._collection.append(Word(obj))
    else:
        return self._collection.append(obj)