[PEAK] Trellis 0.7a2 release

[Phillip J. Eby]

Trellis 0.7a2 is now available for download from the Cheeseshop:

http://pypi.python.org/pypi/Trellis

Release highlights include:

* Removed APIs that were deprecated in 0.7a1

* Rollback now occurs over an entire atomic operation, even if more 
than one recalc pass occurs within that atomic operation.

* Added ``collections.Hub`` type for publish/subscribe operations 
similar to PyDispatcher, but in a declarative, callback-free, and 
extensible manner.

* Various bugfixes

Enjoy!

(Please note that if you have not yet ported your code to the new API 
introduced in 0.7a1, you will need to use 0.7a1 to port your code 
before upgrading.)