HAR seems to contain HTTP status codes which cannot be converted to Int

[manuelkiessling]

org.json4s.package$MappingException: Did not find value which can be converted into int
	at org.json4s.Extraction$.convert(Extraction.scala:603)
	at org.json4s.Extraction$.extract(Extraction.scala:350)
	at org.json4s.Extraction$.extract(Extraction.scala:42)
	at org.json4s.ExtractableJsonAstNode.extract(ExtractableJsonAstNode.scala:21)
	at com.journeymonitor.analyze.spark.HarAnalyzer$$anonfun$1.apply(SparkApp.scala:51)
	at com.journeymonitor.analyze.spark.HarAnalyzer$$anonfun$1.apply(SparkApp.scala:51)