refactor: divided webpack config into separate builds

[damnko]

Before proceeding with #14 I thought to refactor webpack.build.js and split it into separate builds for develop, production and test. Let me know how does it look. I am having problems (in both the current and previous version) running npm run test, does it work on your end?

[JayKan]

@damnko,

Great catch on the npm test errors. For some reasons it's not working currently from my end as well. I will open a PR (#24) for you on setting jasmine testing.

I think Angular2-Webpack-Starter project has a great setup in terms of dev, prod, and test for webpack2. Why don't you follow that project and try to implement the missing testing features?