Change nuxeo-jsf2-migration versioning

For now this module has been configured as a Nuxeo addon, using nuxeo-addons-parent as parent pom, but as it's needed in different situations (Studio for instance), and as it does not rely on the Nuxeo framework, let's use a different versioning for it.

First release was tagged 5.9.6-I20141029_1759 for Studio (see NXS-2220), let's use version 1.1 for the next release.