Display tooltip with info when the Runner is not configured yet
It would be nice to display a tooltip when hovering to the triangle that a Runner needs to be configured in order for the build to start.
![screenshot-localhost_3000_2016-01-19_09-19-56](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
This is what the users see when they go the the failed build page.
![screenshot-localhost_3000_2016-01-19_09-22-23](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
\cc @ayufan @grzesiek @jschatz1