Update README.md
Merge pull request #286 from markalfred/patch-1

Update README.md
Remove jeet-prefixer() mixin

Prefixing can be left to autoprefixing software, allowing only
the needed prefixes to be added, rather than all four of them.
Merge pull request #290 from clear-y/jc/remove-prefixing-capabilities

Remove jeet-prefixer() mixin
Update contributors list

Maintaining a list of users on the readme is not a scalable option due to the volume of activity on this repo. Instead we want to link to the actual contrib graph that github gives us since that is where the real info is

Fixes #291
Center logo on readme
Add inline documentation to Scss functions library

- Sticking to JSDoc conventions as closely as possible
- Using $ for @param names
- Using @warn instead of @throws
- Using {list} type for Scss lists
Add inline documentation to Stylus functions library

It's ported over from the Scss version, but with
any irrelevant bits like non existant parameters removed.
Add inline documentation to Scss mixin library
Add inline documentation to Stylus mixin library