CDATA support

[christianroy]

The parser won't work if a node content is CDATA.

I have made a simple fix and will gladly make a PR if you want: christianroy@c32d26f

The change in function content() is not very elegant, but that was after a full day of yack shaving and I could not figure a single regexp that would work. :( Nonetheless there are tests if anyone would like to try to implement something cleaner.

[laurenskling]

My output is also limited to the first encounter of a CDATA value :(