Escaped HTML strings consistently across Twitter and Facebook. Fixes #47.
Fixes issue reported by haku where SWAPI would crash with Facebook items do not have a 'from' field.
Better map merging in item.rb
Added 'replytoid' field to allow clients to reply to strange things such as Facebook notifications in an intuitive way. Required by haku/Onosendai#87.
Posting an item with no text now returns a 400 error. Fixes #48.