RSS pubDates

- Published dates in feeds
- The SEO team also want us to use `linkText` for external facing feeds
- I've added contributor because the SEO team want that displayed on the Google editors picks

/cc @ironsidevsquincy - so looking at the source code of SyndEntryImpl the [setPublishedDate method](http://grepcode.com/file/repo1.maven.org/maven2/rome/rome/0.9/com/sun/syndication/feed/synd/SyndEntryImpl.java#318) used the DublinCore module to do it's setting and getting. For some reason setting it directly like we tried didn't work, instead you have to set it in the DublinCore module, which generates a pubDate element. Stupid and undocumented.