Merge pull request #37 from BluWings/master

- pom.xml cleanup
#7 fixed support for multiple cdo.xml descriptors
#7 throw an exception if multiple CDO unit with the same name exist
#36 provide a dedicated method in CdoUnitFactory to create a list of CDO units from an URL
#25 added mapping proposals for typed and qualified relations
Merge branch 'master' into osgi

* master:
  #25 added mapping proposals for typed and qualified relations
  #36 provide a dedicated method in CdoUnitFactory to create a list of CDO units from an URL
  #7 throw an exception if multiple CDO unit with the same name exist
  #7 fixed support for multiple cdo.xml descriptors
- implement BundleListener to register OSGi service per found CdoUnit