Major Description
As discussed in http://www.jayasoft.org/node/524 and a number of other discussions, a feature is needed that will enable users to tell Ivy to always update artifacts in the cache if their corresponding files in the local repository change.
Xavier proposes to let Ivy use information in the revision number to detect whether or not an artifact can be updated without a change in its revision. This prevents having to explicitly set attribute 'changing' to 'true' in the Ivy file.
By using a regular expression pattern which can be configured in the Ivy configuration, users can adapt this feature to match their specific setup.