Adds:
- `project`
- `note`
- `screen-full`
- `screen-normal`
- More node.js api endpoints for accessing icons https://github.com/primer/octicons/pull/120
- Creating a spritesheet demo https://github.com/primer/octicons/pull/121
Removes:
- Deprecating support for the webfont https://github.com/primer/octicons/pull/117
- Stop checking `/build/` directory into repository https://github.com/primer/octicons/pull/118
- Removing sass as a dependency https://github.com/primer/octicons/pull/119