Multiple output types

Generates px version from base
Use base version to generate rem and em version

Only px version needs to be maintained.
Merge branch 'multiple' of github.com:hphoeksma/css-toggle-switch into multiple

* 'multiple' of github.com:hphoeksma/css-toggle-switch:
  Multiple output types
Tweaks and fixes after merging the multiple unit output types pull request.
Upgrade bower components and tweak docs styles to match Foundation changes.