Adds:
- Whole new grunt build system including svg sprite sheet.
- adding css min https://github.com/primer/octicons/pull/60
- adding woff2 format https://github.com/primer/octicons/issues/3
- creates spritesheet of svg files https://github.com/primer/octicons/issues/88
Removes:
- Bower support
Fixes:
- all svg icons include viewBox https://github.com/primer/octicons/issues/87
- license in package.json https://github.com/primer/octicons/issues/85