Fix parsing xml CDATA values

[adexin-team]

Currently xml values inside CDATA result to empty string.
For example xml

<Tag>
  <![CDATA[live]]>
</Tag>

results in [{ name: 'Tag', value: '', attributes: [], children: [] }]
while expected result would be [{ name: 'Tag', value: 'live', attributes: [], children: [] }]