Pass in --environment production to denali publish

[seawatts]

Closes denali-js/cli#35

[davewasmer]

I think we actually want to use an environment variable. This -- syntax with npm run means the remaining arguments will be passed to the script that npm run build executes, but we can't guarantee that will be denali build - someone may introduce their own build/prebuild script that invokes denali build along the way. But if we set an environment variable, that has a much better chance of surviving through whatever build script the user adds and making it to the denali build process.

[seawatts]

Will denali build in production if we set NODE_ENV=production?

[davewasmer]

It should, although I'm not 100% sure it does.

[davewasmer]

Closing for lack of activity.

This is something we want to do though (build for production on publish). But see the comments above: environment variable is likely the best way to accomplish this.

If anyone is interested in carrying this across the finish line: we need to verify that NODE_ENV actually does set the environment during build, and then set it here.