Major Description
As requested by Patrick, it would be nice to able in the ivy file to declare that a dependency is a changing one, so that in this case ivy looks if the ivy file has a new publication date compared to the one in cache, and if it is the case it download again the artifacts corresponding to the existing revision.
This derogates to the uniqueness of revision rule in ivy, but it can simplify some use cases.
See http://www.jayasoft.org/node/159 for details