Hey! This pull request fixes 2 small bugs

- The XmlCData.cls class wouldn't compile, because there was an "or" instead of an "||" in one place.
- The data that was in a CDATA section now needs to be xml escaped, as the data can contain XML entities.

For example, my CDATA sections had text like so:

Test & Data

and this failed on XML parse because of the "&". 

Thanks for the nice wrapper!