create a Dockerfile ,with opencv3.2

[xlight]

what changed
add:
Dockerfile
modify: according ##152
chars_identify.cpp load去掉ml::ANN_MLP
plate_judge.cpp load去掉ml::SVM
svm_train.cpp load去掉cv::ml::SVM

[liuruoze]

Good work, but in the new version, we have used a macro to judge the OpenCV version, and solved the Opencv3.2 incompatiable

[liuruoze]

请仅保留dock作为pr内容，然后合并。后续的dock的更新也请助力！