don't allow concurrent jenkins builds of the plugin
don't allow concurrent jenkins builds of the plugin

GateNLP/gateplugin-LearningFramework,GateNLP/gateplugin-LearningFramework,GateNLP/gateplugin-LearningFramework,GateNLP/gateplugin-LearningFramework,GateNLP/gateplugin-LearningFramework