Merge branch 'feature/topLevelPackageJava' into 'master'

uc1-application/build.gradle

...rc/main/java/spesb/uc1/application/ConfigurationKeys.java

...n/src/main/java/spesb/uc1/application/HistoryService.java

.../java/spesb/uc1/streamprocessing/KafkaStreamsBuilder.java

...main/java/spesb/uc1/streamprocessing/TopologyBuilder.java

uc1-workload-generator/build.gradle

...or/src/main/java/spesb/kafkasender/KafkaRecordSender.java

.../main/java/spesb/uc1/workloadgenerator/LoadGenerator.java

uc2-application/build.gradle

...c/main/java/spesb/uc2/application/AggregationService.java

...rc/main/java/spesb/uc2/application/ConfigurationKeys.java

...a/spesb/uc2/streamprocessing/ChildParentsTransformer.java

.../uc2/streamprocessing/ChildParentsTransformerFactory.java

...java/spesb/uc2/streamprocessing/JointFlatTransformer.java

...esb/uc2/streamprocessing/JointFlatTransformerFactory.java

...n/java/spesb/uc2/streamprocessing/JointRecordParents.java

.../java/spesb/uc2/streamprocessing/KafkaStreamsBuilder.java

...java/spesb/uc2/streamprocessing/OptionalParentsSerde.java

...rc/main/java/spesb/uc2/streamprocessing/ParentsSerde.java

...ain/java/spesb/uc2/streamprocessing/RecordAggregator.java