docs: def get_all_attributes(self):
          """
          Returns all sections attributes.
  
          Usage::
  
              >>> content = ["[Section A]\\n", "; Comment.\\n", "Attribute 1 = \\"Value A\\"\\n", "\\n", \
  "[Section B]\\n", "Attribute 2 = \\"Value B\\"\\n"]
              >>> sections_file_parser = SectionsFileParser()
              >>> sections_file_parser.content = content
              >>> sections_file_parser.parse()
              <foundations.parsers.SectionsFileParser object at 0x845683844>
              >>> sections_file_parser.get_all_attributes()
              OrderedDict([(u'Section A|Attribute 1', u'Value A'), (u'Section B|Attribute 2', u'Value B')])
              >>> sections_file_parser.preserve_order=False
              >>> sections_file_parser.get_all_attributes()
              {u'Section B|Attribute 2': u'Value B', u'Section A|Attribute 1': u'Value A'}
  
          :return: All sections / files attributes.
          :rtype: OrderedDict or dict
          """
  
          all_attributes = OrderedDict() if self.__preserve_order else dict()
  
          for attributes in self.__sections.itervalues():
              for attribute, value in attributes.iteritems():
                  all_attributes[attribute] = value
          return all_attributes