db based configs for indexer workers
add missing headers
Merge branch 'master' into autoscaling

Conflicts:
	merger/src/main/java/com/metamx/druid/merger/coordinator/http/IndexerCoordinatorNode.java
bug fixes with ec2 auto scaling
updates to autoscaling config based on code review comments
Merge branch 'master' into autoscaling
Merge branch 'master' of github.com:metamx/druid into autoscaling
Merge branch 'master' into autoscaling
key/value config table
remove redundant index for primary key in config table
Merge pull request #53 from metamx/autoscaling

Use a database to store configurations for indexer workers