The initial idea was to keep it separate since the unattached
links were also to be displayed distinctively from the metrics.
With the new design, unattached links are rendered in the same
list as metrics with attached links.
Therefore, we treat unattached metric links as an empty metric.
* Node details fetching reports at proper timestamp.
* Corrected all the relevant timestamps in the UI.
* Renamed some state variables.
* Time travel works for topologies list.
* Added a whole screen overlay for time travel.
* Polished the backend.
* Make time travel work also with the Resource View.
* Fixed the jest tests.
* Fixed the empty view message for resource view.
* Some naming polishing.
* Addressed the comments.
* 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.
