Cancel build from the portal

[shiftkey]

So I managed to make a build "go rogue"

http://half-ogre-qed.cloudapp.net/octokit/octokit.net/builds/261

And I have no real clue how I did i :metal:

As a starting point, I'd like to cancel this build if it's still running.

[half-ogre]

x-ref #38

[dahlbyk]

Build #261 on octokit.net/bring-back-microsoft-bcl-async started 12175 seconds ago.

[half-ogre]

@dahlbyk Hah!

(It's obviously not really running. It's async/await error handling gone awry.)