Merge pull request #309 from jeff1evesque/python_data_validator

#301: data_validator.py, change 'try-except' langauge
#310: Submodule, add 'jquery validation'
Merge pull request #311 from jeff1evesque/submodule_jquery_validation

#310: Submodule, add 'jquery validation'
#300: data_validator.py, minor comment