def parse(node)
      blip_node = node.xpath('a:blip', 'xmlns:a' => 'http://schemas.openxmlformats.org/drawingml/2006/main').first
      return self if blip_node.nil?

      @file_reference = FileReference.new(parent: self).parse(blip_node)
      self
    end
def parse(node)
      blip_node = node.xpath('a:blip', 'xmlns:a' => 'http://schemas.openxmlformats.org/drawingml/2006/main').first
      return self if blip_node.nil?

      @file_reference = FileReference.new(parent: self).parse(blip_node)
      self
    end
Parse DocxBlip object
 @param node [Nokogiri::XML:Element] node to parse
 @return [DocxBlip] result of parsing