in src/main/scala/com.gu.conf/GuardianConfigurationStrategy.scala [69:77]
def getDeveloperStageBasedProperties(confPrefix: String) = {
val stage = setup.getStage
val location = "classpath:%s/%s.properties".format(confPrefix, stage)
log("Loading developer stage based properties from " + location)
val properties = loader getPropertiesFrom location
new PropertiesBasedConfiguration(location, properties)
}