Make Attributes sample use Maven's commons-attributes plugin.

samples/attributes/project.properties

@@ -1,13 +1,10 @@
-# Ant properties for building the Attributes sample application.
 # $Id$
 
-name=attributes
-src.dir=src
-src.generated.dir=generated
-lib.dir=${basedir}/../../lib
-dist.lib.dir=${basedir}/../../dist
-build.dir=classes
-jalopy.xml=${basedir}/../../jalopy.xml
-reports.dir=reports
-test.includes=**/*TestSuite.class **/*Tests.class
-test.excludes=**/Abstract*
+######################################################################
+# Commons-Attributes
+######################################################################
+org.apache.commons.attributes.enable=true
+org.apache.commons.attributes.index.enable=true
+
+# Having difficulty? Try executing "maven install-plugin" from the
+# attributes directory. See the maven.xml for what this goal does.