NumberedShardSpec

Conflicts:
	common/src/main/java/com/metamx/druid/partition/IntegerPartitionChunk.java

Wikipedia firehose

Basic unit tests for realtime functionality

1) bug fix for RemoteTaskRunner removing workers race condition
2) partition chunks not being sorted by chunk number

bug fix for RTR removing workers race condition and partition chunks not being sorted by chunk number

Task announcement

Each shard has a number, and there are a fixed number of shards that will
form a complete set.

This allows the API/GUI to return reasonable results when the primary
task runner is a ForkingTaskRunner.