bugfix: fix classpath for javadocs

Author: gwhalin

build.xml

@@ -90,6 +90,7 @@
 			private="true"
 			version="true"
 			defaultexcludes="yes"
+			classpathref="project.class.path"
 			use="true"
 			windowtitle="java memcached client api documentation"
 			doctitle="<h1>${project.title} documentation (Version ${ver})</h1>"