Move to Java 6.0
Updated all build paths to use a generic Java 6.0 environment.
Updated all build configuration to get source and target level from
the generic environment settings.
Updated all Java facets to 6.0.
Fix restriction on NotImplementedException
An access restriction rule exists on sun.* classes when 
using Java 6.0; changed the sun internal exception to the 
java UnsupportedOperationException
Merge branch 'master' into java6-update
Merge pull request #24 from LorenzoBoccaccia/java6-update

Java 6.0 project update