Changed distribution tests to use fixed seed. JIRA: MATH-418.  Thanks to Venkat Murthy.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1606387 13f79535-47bb-0310-9956-ffa450edef68
Fixed javadoc typo.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1606389 13f79535-47bb-0310-9956-ffa450edef68