remove initial delay from polling

remove initial delay from polling in coordinator, this will help in the
cases when the pollDuration is set to higher than coordinator
startDelay.

This reverts commit 76437379, reversing
changes made to 79e6d4eb.

Conflicts:
	pom.xml

Refactor and clean-up Druid data ingestion Part 1 (The Schemas)

Conflicts:
	indexing-hadoop/src/main/java/io/druid/indexer/HadoopDriverConfig.java
	indexing-hadoop/src/main/java/io/druid/indexer/HadoopDruidIndexerConfig.java
	indexing-hadoop/src/main/java/io/druid/indexer/HadoopDruidIndexerConfigBuilder.java
	pom.xml
	server/src/main/java/io/druid/segment/realtime/RealtimeManager.java
	server/src/main/java/io/druid/segment/realtime/firehose/EventReceiverFirehoseFactory.java

Multithread costbalancer

Support null values in DimExtractionFn in topN and groupBy

Union query source

remove toShortString
minor other changes

Allow config-based overriding of hadoop job properties.

Cardinality aggregator

Move the event receiver firehose such that standalone realtime nodes can use it

Alpha-numeric sorting for topN

Smarter server selection at the broker level

Add more endpoints, fixes #517

max being no. of processors - 1