Added opencv version check to configure.py.
Added opencv version check to configure.py.

tingjianlau/EasyPR,wrestle/EasyPR,feiyungu/EasyPR,micooz/EasyPR,liuruoze/EasyPR,micooz/EasyPR,tingjianlau/EasyPR,liuruoze/EasyPR,feiyungu/EasyPR,wrestle/EasyPR,nuan-nuan/EasyPR,micooz/EasyPR,liuruoze/EasyPR,feiyungu/EasyPR,liuruoze/EasyPR,tingjianlau/EasyPR,nuan-nuan/EasyPR,wrestle/EasyPR,wrestle/EasyPR,feiyungu/EasyPR,tingjianlau/EasyPR,micooz/EasyPR