[COLLECTIONS-481] Use varargs parameter in CompositeSet.addComposited, fixed conflict resolution when using more than 1 Set as argument. Thanks to Hollis Waite.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1521262 13f79535-47bb-0310-9956-ffa450edef68
Added Hollis Waite as contributor.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1521263 13f79535-47bb-0310-9956-ffa450edef68