Added dayOfWeekNum to JS side
Merge branch 'master' of https://github.com/qminer/qminer
Added evaluation.js with evaluation metrics functions:
- mean error
- mean absolute error
- mean square error
- root mean square error

Added copyVecToArray to linalg.js
Merge pull request #1 from bkazic/master

Added evaluation.js and some other minor changes (bugfix in KNN, copyVecToArray, dayOfWeekNum)