Notes:
Bug-fix release.

Some minor API changes and enhancements (MyModel#[] only accepts a
primary key now, not an options hash).

database.get (equiv to AR's find_by_id) is approximately 25% faster
than previous.

No longer must you inherit from DataMapper::Base. Instead now you can
include the DataMapper::Persistence module in your models (::Base is
preserved for backwards compatibility).


Changes:
-- 0.2.5
* has_one bugfixes
* Added syntax for setting CHECK-constraints directly in your
properties (Postgres)
* You can now set indexes with :index => true and :index => :unique
* Support for composite indexes (thanks to Jeffrey Gelens)
* Add composite scope to validates_uniqueness
* Added private/protected properties
* Remove HasOneAssociation, Make HasManyAssociation impersonate
has_one relationships
* Added #get method
* Persistence module added, inheriting from DataMapper::Base no longer
necessary