Use presets from polymer-build

[bendavis78]

I used this expecting it to behave similarly to polymer-cli's polymer build command. The polymer build command creates directories for presets, such as es5-bundled, es6-bundled, and es6-unbundled. It would be nice if this plugin read presets from polymer.json during the build process in order to create separate builds.

[bendavis78]

Actually, now that I think of it, there should be a way to replicate each of the "Build Configuration" options from polymer.json. It doesn't look like this plugin does that?

[ronnyroeller]

Actually, now that I think of it, there should be a way to replicate each of the "Build Configuration" options from polymer.json. It doesn't look like this plugin does that?

Indeed, it doesn't do this right but indeed it would make sense. I'd be happy to merge a PR if somebody wants to implement that.