#572 - skip logic refactoring
#572
#572
#572
#572
Merge branch 'master' into skipLogicRefactoring
#572
#572
#381 - Single select skip logic
#577 - hide unselectable questions from list
#559 - multiselect skip logic
#561 - operator types in skip logic
#573 - integer validation for skip logic
#573 - integer validation
Merge pull request #126 from kobotoolbox/tp573

Tp573