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
1) Adjust IndexMerger to create convert the indexes it creates from the old format to the new.  This is done quite sub-optimally, but it will work for now...
Merge branch 'master' of github.com:metamx/druid
YeOldePlumberSchool: Populate dimension metadata in segment descriptor
1) Remove vast majority of usages of IndexIO.mapDir() and deprecated it.  IndexIO.loadIndex() is the new IndexIO.mapDir()
2) Fix bug with IndexMerger and null columns
3) Add QueryableIndexIndexableAdapter so that QueryableIndexes can be merged
4) Adjust twitter example to have multiple values for each hash tag
5) Adjusted GroupByQueryEngine to just drop dimensions that don't exist instead of throwing an NPE
1) Fix some bugs found by external test suite
1) Upgrade java-util dependency to include "ruby" time
key/value config table
Merge branch 'master' into yops-descriptor-dimensions
YeOldePlumberSchool: Tweak for IndexIO changes
Merge pull request #57 from metamx/yops-descriptor-dimensions

YeOldePlumberSchool: Populate dimension metadata in segment descriptor
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