* Added a zoom slider control in the bottom-right corner.
* Made the control vertical and added the buttons.
* Adjusted the styles and borders.
* Trying to fix Webpack
* Hide zoom control when there is no content.
* Polished the code.
* Upgraded Webpack 1.13 -> 2.2
* Made webpack.prodution.config.js work and updated yarn.lock
* Updated a lot of small dependencies.
* Upgraded React
* Bunch of small devDependencies updated.
* Fully updated devDependencies
* Updated optionalDependencies
* Updated everything except D3 zoom.
* Fixed linting error.
* Another update.
* Reverted materialize-css upgrade and applied new eslint rules
* Final fixes to webpack configs.
* Updated yarn.lock again.
