Test run status

[gsnedders]

It'd be nice to have something saying when the next run per-browser is scheduled for (and potentially status of ongoing runs showing some percentage complete).

[foolip]

http://builds.wpt.fyi/ exists, so I'll close this. @gsnedders if you're looking for something more generic that'd work across runners, please file an issue at https://github.com/web-platform-tests/wpt.fyi/issues/new.