nsqadmin: /empty_channel should redirect back to channel
Merge pull request #145 from mreiferson/empty_redirect_145

nsqadmin: empty channel should redirect back to channel
nsqd: empty should clear inflight and deferred

* refactor empty/flush code
Merge pull request #144 from mreiferson/empty_144

nsqd: empty queue does not empty deferred/inflight
add broadcast-address option
add broadcast address
update test with broadcast addr
format
format
add hostname key to lookup
add hostname field
fmt
update test
add broadcast address and hostname to nodes admin page
fmt
more Address changes
update to use broadcast address with identify and all throughout the lookup
update test for broadcast_address
test broadcast address
remove debug line