Merge pull request #2 from jordan-lewis/development

Development
Merge pull request #3 from jordan-lewis/development

Upgrading Middleman 3.0
Merge pull request #4 from jordan-lewis/development

Major refactor of JS + SCSS
Merge pull request #6 from jordan-lewis/development

[update] New features + bug fixes
Update README.md
[mixins] Added 2 new mixins to library