Fixing crashes with --invert_hash and more descriptive name for latent factors.
Added name space prefix to latent factor to make it easier to identify movielens latent factors.
Generated human readable models for movielens demo. The latent factors can now be inspected.
Demo of latent factor extraction: hierarchical clustering of movies.
Merge branch 'master' into fix_lrq_invert_hash
Merge pull request #324 from alexeyrodriguez/fix_lrq_invert_hash

Allow the use of --invert_hash to extract the latent factors generated in --lrq