Solved the problem with integer overflow with winsize.
Added .first and .last to stores (both in C++ and JS). Added forward moving and backward moving iterators on C++ and JS side. Updated tests to correpsond to new reality.
Merge pull request #13 from blazf/master

Added .first and .last to stores (both in C++ and JS). Added forward mov...
Merge https://github.com/qminer/qminer
Merge pull request #14 from klemenkenda/master

Solved the problem with integer overflow with winsize parameter.
Merge branch 'master' of github.com:qminer/qminer