tech debt: api routing silliness

[iameli]

I made a few last minute changes to get API things routing to the worker or upstream server as appropriate. https://github.com/livepeer/livepeerjs/blob/master/packages/api/src/app-router.js#L134

These are pretty ugly. Let's figure out a better way to configure this, probably by having a single list of path-to-regexp strings that control which route goes where.