refactoring (prepping) skip logic code
#256 - A user is able to specify whether a question is valid when response is equal to a provided value
#256 - A user is able to specify whether a question is valid when response is equal to a provided value
#256 - A user is able to specify whether a question is valid when response is equal to a provided value
minor css fixes related to skip logic/validation logic
#256 - validation logic fixes
#256 - validation logic fixes
minor styling fix
#265 - fixes issues with question types with no operators
validation logic parser tests
Merge pull request #499 from kobotoolbox/validation-logic

Validation logic