Fixed few bits in analytics batch model learning.
Merge pull request #68 from rupnikj/master

store.getCol and rs.getCol were refactored to store.getVec, store.getMat...
Cleaning, added some little helpers to JS utilities.
each and map on stores and record sets now run much faster due to reuse of TJsRec wrapper between callback calls. Same goes for store iterators. Implementation of each and map for stores is now in C++. All together, each and map now run around 45 times faster! :-)
Merge branch 'master' of github.com:qminer/qminer
Removed a warning for unused variable.
Merge pull request #69 from blazf/master

Faster `each` and `map` on record sets and stores
store.cell bugfix
Merge branch 'master' of github.com:qminer/qminer