Use generic parameter.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1522088 13f79535-47bb-0310-9956-ffa450edef68
Remove trailing spaces.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1522089 13f79535-47bb-0310-9956-ffa450edef68