Added:
- New annotation shapes: polygons, polylines, points
- Undo/redo feature
- Grid to estimate size of objects
- Context menu for shapes
- A converter to PASCAL VOC format
- A converter to MS COCO format
- A converter to mask format
- License header for most of all files
- .gitattribute to avoid problems with bash scripts inside a container
- CHANGELOG.md itself
- Drawing size of a bounding box during resize
- Color by instance, group, label
- Group objects
- Object propagation on next frames
- Full screen view

Changed:
- Documentation, screencasts, the primary screenshot
- Content-type for save_job request is application/json

Fixed:
- Player navigation if the browser's window is scrolled
- Filter doesn't support dash (-)
- Several memory leaks
- Inconsistent extensions between filenames in an annotation file and real filenames