[Radiant] Shards not changing UI

[Andrew O'Brien]

I've started using some extensions that use Shards for the first time
and ran into a bit of a problem: there are no changes in the admin UI
that I can see.  I'm not getting any errors, so I'm pretty sure This
is happening with both Reorder and Scheduler, so I think this has to
be an issue with Shards or how I've set it up.

My setup:
* Radiant 0.6.4 unpacked into vendor
* Shards is definitely loading first in config.extensions in environment.rb
* Migration and update tasks have been run for all extensions
* Extensions are all definitely loading and enabled (confirmed by
putting debug messages in #activate)
* All extensions are from the git repository as of today

Anything I missed?

-Andrew