Octicons

- Removing `file-text` and `mail-reply` icons. Use `file` and `reply` respectively.
- Removing spritesheet calls and `to_svg_use` method.

Fixes:

- projects icon renders as a block, using `fill-rule` fixes it

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

Adds:

- svg.json file that is accessible from node require

Fixes:

- Vertical alignment on `italic`

Modifies:

- `person`
- `organization`

Fixes:

- Removing inline sourcemap from `min` versions of css.