[build] Moved config files into subfolder, fixed webpack watch mode

[spoenemann]

I moved mocha.opts, tslint.json, webpack.config.js and the base compiler options from tsconfig.json to the new subfolder configs. We cannot move the whole tsconfig.json there because that doesn't seem to work with ts-loader, which is currently used with mocha and webpack.

I fixed the watch mode for webpack (kept running into an infinite build loop) and moved bundle.js into examples.