Major release

New in this version:
- Improved clustering performance. There should now be fewer duplicate
stories and less noise within stories.
- Integration with AIDR's predict module, to get customizable automated
topic classification for tweets and stories.
- New web front-end that replaces the old one. The new front-end
provides better search and filtering with less dependency on manual
curation. The important geographic map has been removed, but will
hopefully make a comeback once we find away to do semi-automated
location classification.

Scripts are available for creating the database from scratch, but the
incremental update script has unfortunately not been maintained in this
version.