fix(MdMinValueValidator): do not use max validator logic
fix(MdMinValueValidator): do not use max validator logic

 - closes #61

mailiam/ng2-material,Q-Free-OpenRoads/ng2-material,Q-Free-OpenRoads/ng2-material,Q-Free-OpenRoads/ng2-material,dmacfarlane/ng2-material,Q-Free-OpenRoads/ng2-material,paulussup/ng2-material,dmacfarlane/ng2-material,parmalatinter/ng2-material,parmalatinter/ng2-material,parmalatinter/ng2-material,mailiam/ng2-material,mailiam/ng2-material,dmacfarlane/ng2-material,paulussup/ng2-material,paulussup/ng2-material