#461: svm_json.py, import 'defaultdict', remove 'json' import
#461: svm_json.py, correct logic
#461: svm_json.py, 'import json'
#461: svm_json.py, add comments
#461: svm_json.py, replace 'print' -> 'return'
#461: svm_json.py, minor language change
Merge pull request #682 from jeff1evesque/python_svm_json

#461: Define method to convert 'csv' to 'JSON'