Timeline feature (Experimental)

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+## Contributing
+
+Contributions to the vis.js library are very welcome! We can't do this alone.
+You can contribute in different ways: spread the word, report bugs, come up with
+ideas and suggestions, and contribute to the code.
+
+There are a few preferences regarding code contributions:
+
+- vis.js follows the node.js code style as described
+  [here](http://nodeguide.com/style.html).
+- When implementing new features, please update the documentation accordingly.
+- Send pull requests to the `develop` branch, not the `master` branch.
+- Only commit changes done in the source files under `lib`, not to the builds
+  which are located in the folder `dist`.
+
+Thanks!