Issue 63 fix signature of setItemTag REST API method

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@572 0d189622-dca1-7e23-9e30-e8815eb7bd2f
Update to Commons Math 3.2. Use new rank-revealing QR decomposition. Better method for detecting rank, and can loosen the singularity threshold default.

git-svn-id: http://myrrix-recommender.googlecode.com/svn/trunk@573 0d189622-dca1-7e23-9e30-e8815eb7bd2f