Refactor shape classes in script.coffee
- Rename Box to Rectangle
- Rename Shape to ResizableRectangle
- All shapes now inherit the Shape class
Change project structure
- ./src: CoffeeScript and LESS
- ./static: Deployable static app content. The user only needs to see
  contents of this directory.
Update .gitignore
Gitignore files created by LESS
Create Cakefile