GET /v3/channels/:id/logs implemented

v121

Merge pull request #227 from heroku/ypaq-ensure-logplex-1-content-typ…

GET /v3/channels/:id/logs implemented

Control rod script (#216)

* Add script for on the fly control rods
* Add function to kill all tail sessions
* Adopt feedback and fix firehose control rod

Ensure logplex-1 content-type for channel logs endpoint

Merge pull request #211 from heroku/control-rod-drain-forwarding

control rod to stop drain forwarding

Redgrid control rod release

Merge pull request #210 from heroku/ctrl-rod-crew-rod-to-disable-redgrid

Add control rod to disable redgrid

Control Rod Release 1

Merge pull request #209 from heroku/ctrl-rod-crew-deny-redis-buffers

Add control rod to deny redis buffers