code: public static Iterable<String> getPackageClassesNames(String packageName) {
  		return getPackageClassesNames(packageName, Thread.currentThread().getContextClassLoader());
  	}
docs: Retrieves names of classes from given package.
  <p/>
  <p>
  The package must be annotated with {@link IndexSubclasses} for the classes inside
  to be indexed at compile-time by {@link org.atteo.classindex.processor.ClassIndexProcessor}.
  </p>
  
  @param packageName name of the package to search classes for
  @return names of classes from package