Created step 5a: split_data_5a
The input is the train file, and the output includes two files: trainset.csv, devset.csv
The default ratio is 0.7
Model Training:
1. Retructured the model train section, move svm_train and svm_test methods to utils
2. Added the evaluation of error rate based on the correctness of predicted option combinations
3. Fix some bugs
Merge branch 'allstate_train'