Fix incorrect handling of CDATA content. See #15.

[pavelhoral]

• Removed greedy space removal between elements (not sure if that can break anything).
• XML declaration <?xml won't format CDATA won't add new-line.

Changed test to contain:

<![CDATA[ <?<z>   </z> ]]>

That should display effect of both changes.

[pavelhoral]

Just noticed that the change is introducing unwanted new-lines in case there were new-lines in the source. WiIl look into this and update the merge request.

[pavelhoral]

Fixed. I have replaced the original greedy white-space removal with additional condition which removes excessive white-space when not in comment context.