Matching latest Riddle interface.
Conflicts: HISTORY spec/thinking_sphinx/search_spec.rb
Conflicts: HISTORY lib/thinking_sphinx/version.rb
This only happens when there's no primary key index on the model's table - can't see it happening much, but let's have a smart default just in case. Thanks to Christian Hellsten for determining the cause.
Conflicts: HISTORY README.textile
…will fail to start, but the log file will be completely empty.