Problem: QML bindings do not support json type
Solution: Add handling of the json type
Problem: In zproject_class.gsl error variable is not reset
Solution: Reset error to undefined at each loop iteration
Merge pull request #84 from jemc/master

Problem: QML bindings do not support json type
Merge pull request #85 from jemc/error_reset

Problem: In zproject_class.gsl error variable is not reset
Reduce repetition in _PROGRAMS related _LDADD generation.