WHAT'S NEW IN RADIANT

* Added support for extensions--an extremely flexible way to extend
  Radiant
* Merged Behaviors into the Page class; subclass page now instead
* Improved database support for Postgres and Sqlite
* Limited support for SQL Server
* Exceptions from tags now bubble up during testing
* Page parts are now sorted by ID so the order that you create them in
  is preserved [Josh Ferguson]
* Implemented tag documentation DSL and UI [Sean Cribbs]
* Reworked the setup code
* Renamed script/setup_database to rake db:bootstrap
* Reworked the upgrade code to work around rake tasks
* Added rake tasks for freezing and unfreezing radiant to the edge
* r:children:each, r:children:first, and r:children:last now all accept
  the same ordering and limit attributes and have the same defaults
* Snippets are now responsive to global context via the r:page tag. This
  means that any tags inside r:page will refer to the page currently
  being rendered, i.e. the page requested, not the local contextual page
  via tags like r:children:each, etc. This is most relevant to recursive
  snippets like the sitemapper example [Sean Cribbs]
* r:navigation now uses the pipe character ("|") to delimit URLs in the
  urls attribute rather than the semi-colon
* :date now accepts a "for" attribute that specifies which attribute of
  the page to render. Valid values of the attribute are published_at,
  updated_at, created_at, and now.
* Created the r:cycle tag to make alternating tables and lists possible
* Added popups for filter and tag documentation inside the page editing
  interface
* Added support for optimistic locking for all models [Daniel Shepherd]
* Added support to Radiant::Config for boolean values [Sean Cribbs]
* Caching no longer stores the headers and body in the same file [Daniel
  Shepherd]
* Added support for the X-Sendfile header that works in conjunction with
  caching to speed it up (by default X-Sendfile support is off) [Daniel
  Shepherd]
* Moved the images and stylesheets into images/admin and
  stylesheets/admin respectively to make it easier for Radiant's assets
  to coexist easily with the site's assets
* Improved the Javascript that automatically updates the slug and
  breadcrumb based off of the title so that it now response to all
  change events