Parsing of files with /text/group/text

[knit-bee]

For TEI files that contain text/group/text the current parsing scheme will break.
E.g.

<TEI>
  <teiHeader/>
  <text n="1">
   <group>
     <text n="2"/>
     <text n="3"/>
  </group>
 </text
</TEI>

will be return as :

<TEI>
  <teiHeader/>
  <text n="2"/>
  <text n="3"/>
  <text n="1">
    <group>
    </group>
  </text>
</TEI>