This merges in a pull request by Shekhar, adding support for CDATA
content:
---
If type specified CDATA content won't be escaped. This makes it easier
for RSS publishers and readers. Also adheres CDATA recommendation at
http://www.rssboard.org/rss-profile#element-channel-item-description
---
Signed-off-by: Lars Kiesow <lkiesow@uos.de>