This field is used to help the maven plugin to bundle the content and generate the `Export-Package` field in the  `MANIFEST.MF` file.
`Export-Package` is used by OSGi to resolve where to find the content of a package, if an other bundle has a dependency on it. So it should have the right version for things to work well.
Looking at the doc of the maven plugin, it looks like it would try to do the right thing if we don't specified a version (`Export-Package` in the [doc](http://felix.apache.org/site/apache-felix-maven-bundle-plugin-bnd.html). I didn't test it). Otherwise the right version need to be set, and it should match the dependencies definition in [sbt](https://github.com/sbt/sbt/blob/0.13/project/Util.scala#L164).
For `org.apache.ivy`, I think it could be just removed. There is no package with this name added to the new bundle. And it doesn't appear in the resulting `MANIFEST.MF`.