Crashes when attempting to parse a media link.

Bug source:
feedtools-0.2.29/lib/feed_tools/feed_item.rb:1152

Solution:
Convert the enclosure_media_text to string as follows:

enclosure.text = FeedTools::HtmlHelper.unescape_entities(
                enclosure_media_text.to_s)

For some reason, some feeds (such as MTV, e.g. http://buzzworthy.mtv.com/feed) cause the enclosure_media_text var to
be something other than a string.