[Feature request] Possibility to change dist folder
I'm trying to achieve vue ssr runned by pm2. Ream would be perfect for my use case but the problem is that i'm trying to run multiple instances of it programmatically so I need multiple `dist` folders. 

My target would be that one instance would write to `dist/in1/`, second one would write to `dist/in2/` and so on.

It would be great to have dist folder configurable through `ream.config.js` 