MAHOUT-1438 quickstart tutorial for building a simple recommender

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1575720 13f79535-47bb-0310-9956-ffa450edef68
Mahout-1413: Rework Algorithms Page

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1575732 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1434: Dead links on web site

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1575733 13f79535-47bb-0310-9956-ffa450edef68