Added functions for computing value averages for the matrix. Necessary to calculate biases
removed node_modules
Implemented Bias calculation. Not yet included in descent model
Fixed constants export
Incremented package version
Fixed regression test. Still overfitting zeroes so estimated ratings are junk. Need to fix.
Refactored error to ignore zero inputs and fixed some tests
Merge pull request #4 from sbyrnes/Fix3_User_Biases

Fix3 user biases