CF toolkit: Use rankUpdate() to calculate XtX in ALS and WALS#24

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msperlich wants to merge 5 commits intoGraphChi:masterfrom msperlich:master

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Commits on Apr 29, 2014

Fixed typo in regnormal code
Max Sperlich
committed

Commits on May 5, 2014

Merge branch 'master' of https://github.com/GraphChi/graphchi-cpp
Max Sperlich
committed
LibFM: fixed typo in load last_item_bias code
Max Sperlich
committed

Commits on May 14, 2014

Merge branch 'master' of https://github.com/GraphChi/graphchi-cpp
Max Sperlich
committed
ALS/WALS: use rankUpdate() to update XtX
Max Sperlich
committed