Use REPLICATION_FACTOR for Aggregator router

createAggregatorService is creating a ConsistentHashingRouter without using the REPLICATION_FACTOR setting, fixed to include this setting as defined in aggregator section of conf file.
Merge pull request #1 from mryanmurphy/patch-1

Use REPLICATION_FACTOR for Aggregator router
Merge pull request #226 from mryanmurphy/master

Fix aggregator replication factor setting