upgrade jetty version

upgrade jetty version to 9.1.5.v20140505
Update DetermineHashedPartitionsJob.java

CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.
Update IndexGeneratorJob.java

CombineTextInputFormat instead of TextInputFormat combines multiple splits for a single mapper and reduces the strain on hadoop platform. It greatly improves job completion time as there are fewer number of mappers to bookkeep.
Fixed duplicated dependency
Make RabbitMQ Firehose resilient to broker deconnections
Merge pull request #561 from deepujain/master

Improve ingestion MR job completion time.
Merge pull request #562 from tucksaun/fix-duplicate-dependency

Removed duplicated dependency
Merge pull request #559 from metamx/upgrade-jetty

upgrade jetty version
Merge pull request #563 from tucksaun/fix-rabbitmq-connection-retries

Make RabbitMQ Firehose resilient to broker deconnections