Merge remote-tracking branch 'origin/develop' into develop

HISTORY.md

dist/vis.js

dist/vis.min.js

examples/timeline/01_basic.html

examples/timeline/03_much_data.html

src/graph/Edge.js

src/graph/Graph.js

src/graph/Node.js

src/graph/graphMixins/ClusterMixin.js

src/graph/graphMixins/HierarchicalLayoutMixin.js

src/graph/graphMixins/ManipulationMixin.js

src/graph/graphMixins/MixinLoader.js

src/graph/graphMixins/SelectionMixin.js

src/graph/graphMixins/physics/BarnesHut.js

src/graph/graphMixins/physics/PhysicsMixin.js

src/timeline/component/ItemSet.js