Add react-jss plugin

[kentcdodds]

This is the first new plugin. Let's see if we can make this work... Help appreciated @kof!

[codecov-io]

Codecov Report

Merging #1 into master will decrease coverage by 0.91%. The diff coverage is 87.87%.

@@            Coverage Diff            @@
##           master      #1      +/-   ##
=========================================
- Coverage   91.72%   90.8%   -0.92%     
=========================================
  Files           5       6       +1     
  Lines         145     174      +29     
  Branches       31      35       +4     
=========================================
+ Hits          133     158      +25     
- Misses          8      11       +3     
- Partials        4       5       +1

Impacted Files	Coverage Δ
src/babel-plugin.js	92.15% <100%> (-0.16%)	:arrow_down:
src/plugins/glamorous.js	100% <100%> (ø)	:arrow_up:
src/plugins/react-jss.js	86.66% <86.66%> (ø)

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