instead of using the old baseName=smack appendix=project.name approach,
we are now going convention over configuration and renaming the
subprojects directories to the proper name.
Having a prefix is actually very helpful, because the resulting
libraries will be named like the subproject. And a core-4.0.0-rc1.jar is
not as explicit about what it actually *is* as a
smack-core-4.0.0-rc1.jar.
SMACK-265
The jingle subproject builds now. This doesn't change that the code is
outdated with regard to the specification and unmaintained for
years. But hopefully this is the first step to change that. :)
The integration tests have been moved into SourceSets of 'core' and
'extensions'.
