Enable cookies when fetching feeds with curl

If a feed requires cookies, curl needs to have them active in order to
access it. This is done by setting the COOKIE_JAR option.
Since we do not need the actual cookie jar, send it to /dev/null, curl
will still have a valid in-memory cookie jar.
getFeedArticles: use date_entered for fresh feed same as queryFeedHeadlines (closes #780)
Merge pull request #311 from fsateler/curl-cookie-jar

Enable cookies when fetching feeds with curl
Revert "sanitize: remove doctype properly, add experimental workaround against unnecessary html elements in sanitized data"

This reverts commit f44d59992edac23206f593e240f0e445c571b661.
Merge remote-tracking branch 'upstream/master'