Refactor indexing

index-common -> renamed to indexing-common (files under package com.metamx.druid)
indexer -> renamed to indexing-hadoop (files under package com.metamx.druid.indexer)
merger -> renamed to indexing-service (files under package com.metamx.druid.indexing)

- all .*merger.* configs renamed to indexer
- master and indexing service consoles now both return condensed metadata to improve performance
- indexing service will only start up resource manager if not in remote mode