make the hadoop index task work again
fix docs for deep storage
Merge pull request #269 from metamx/fix-task

Refactor Hadoop-based indexing to repair broken Hadoop Index Task
fix bug and make it actually possible to load extensions
update s3 calls to not use deprecated fns
fix extensions config not getting picked up in hadoop index task
more docs about how to use different versions of hadoop in druid
fix typo in docs
fix task docs and indexing service img