Adds splunk distributed search peers poller

 - Emits metrics about up/down peers
 - Emits metrics about total peers
 - Emits metrics about replication status
gofmt splunk_search_peers_poller.go
oops. committed some creds. time for cred roll
splunk-search-peers-poller
Add network timeout env var
Cleanup changes

- Transition to NetworkTimeout instead of LibratoNetworkTimeout
- Utilize URL environment helper for LibratoUrl
Let's commit everything this time.
Merge branch 'master' of github.com:heroku/shh

Conflicts:
	config.go
	librato_output.go
Release version 0.8.8