MAHOUT-1492 - Replace URL's with modern equivalent.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1582417 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1492 - Also fix javadoc

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1582420 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'remotes/origin/trunk' into trunk