- Added new widget SketchTeaser
- Moved get_recent_sketches as static method in LMSSketch
- Added `models.py` to make it easy to import Course and Sketch class
- Updated the sketches template to use the SketchTeaser widget
The URL of a sketch will be `/skectes/<sketch-name>`. That would still be like
`/skectes/SKETCH-123`. It would interesting to try to make it `/sketches/123`.