Reduces the package output

[abdonrd]

Fixes #928.

This reduces the package size.

[web-padawan]

Consider using "files" property instead to specify the included files explicitly: https://docs.npmjs.com/files/package.json#files

[abdonrd]

@web-padawan should be like this, right?

  "files": [
    "bundles/**/*",
    "entrypoints/**/*",
    "custom-elements-es5-adapter.js",
    "webcomponents-bundle.js",
    "webcomponents-bundle.js.map",
    "webcomponents-loader.js"
  ]

Or am I leaving something?

[dfreedm]

Hmm, is package size a concern?

[abdonrd]

@azakus Less is better. And we would save ourselves problems like having to ignore the gulpfile.js in the PSK and in the other templates.

[abdonrd]

Rebased on master and updated PR branch! :)

[keanulee]

+1 on reducing package size. This seems to be what most other npm packages do (request, redux, sw-precache, and more).

[TimvdLippe]

This seems like a good change to me.

[abdonrd]

Thanks for the review, @TimvdLippe!
Hoping it can be merged.

[TimvdLippe]

Thanks!