Adding the ability to modify the default ''onerror'' property in the ''<build>'' element. If not specified, the behavior is unchanged; by default any step failure will result in the build failing and stopping. Added a new ''continue'' onerror specification-- it's similar to ''ignore'' except the results of ''continue'' steps are counted in the overall build status (in ''ignore'' they're ignored.) You'll need to upgrade both your master and slaves if you wish to use the ''<build>'' element override or the new ''continue'' value. Will update http://bitten.edgewall.org/wiki/Documentation/recipes.html . Thanks to jerith for comments. Closes #409. Refs #210.