Extract common files and configs

[mxstbr]

• Move *rc files to root folder
• Move all common dependencies to root folder package.json
• Remove resolve.root config in order to make this easier, closes #13
• Move assets/, data/, utils/ and index.html template to root examples/ folder for reusability between examples. finally closes #7
• Create shared base webpack config that can be extended for custom loaders etc.

This means all the files in the actual example folder are solely related to example. It only contains the config of webpack that diverges from the standard config, it only contains the dependencies that deverge from the standard dependencies. Other than that it just contains the actual app.

Those two things combined, only showing convergence from standard configs and dependencies and only having actual app code in there, makes for a much easier comparison between the methods of styling used.

[mxstbr]

Please review @MicheleBertoli @threepointone!

[mxstbr]

Merging this for now to get on with it! Feel free to open issues/PRs about stuff you don't like.