#290 Correction for `OntrackBuildPropertyValue`
 #290 Correction of:
 - LastBuildPollingTrigger
 - LastBuildWithPromotionLevel
 - LastBuildWithValidationStamp
 - PromotionLevelPollingTrigger
 - ValidationStampPollingTrigger
Merge pull request #291 from cpf/master

 #290 Correction of expanding variables