[WIP] Emotion

[nathanmarks]

Trying out emotion to replace Radium. Making it so the style props are backwards compatible to make potential migration for consumers easier.

This isn't finished, but docs run and all looks great!!

Gonna try it out in its current form on our apps... technically everything should just work.

Still need to:

• [x] pass through className on all components. At least where we currently pass style through, to support putting css={} on snacks components for overrides (css={} props get turned into className being passed by emotion)
• [ ] (??MAYBE??) convert theming system to use emotion theming system
• [ ] prob some other stuff i can't think of right now

[codecov[bot]]

Codecov Report

Merging #331 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
+ Coverage   82.22%   82.25%   +0.02%     
==========================================
  Files          59       59              
  Lines        1221     1223       +2     
  Branches      218      218              
==========================================
+ Hits         1004     1006       +2     
  Misses        165      165              
  Partials       52       52

Impacted Files	Coverage Δ
src/components/Forms/ValidationError.js	100% <ø> (ø)	:arrow_up:
src/components/SVGIcon/SVGIcon.js	100% <ø> (ø)	:arrow_up:
src/base/RadioCheckboxBase.js	100% <ø> (ø)	:arrow_up:
src/components/Menus/Menu.js	35.38% <ø> (ø)	:arrow_up:
src/components/Buttons/Switch.js	100% <ø> (ø)	:arrow_up:
src/components/Tooltip/TooltipPosition.js	85.71% <ø> (ø)	:arrow_up:
src/components/Forms/MaskedTextField.js	81.25% <ø> (ø)	:arrow_up:
src/components/Link/Link.js	100% <ø> (ø)	:arrow_up:
src/components/Forms/TextField.js	87.5% <ø> (ø)	:arrow_up:
src/components/Tooltip/Tooltip.js	84% <ø> (ø)	:arrow_up:
... and 43 more

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