Filter props on composed components

[emmatown]

What:

Filter props on components that are styled components that have string tags. For example the props on Link will now be filtered.

const BaseLink = styled.a`background-color: hotpink;`
const Link = styled(BaseLink)`color: green;`

Why:

Because otherwise there will be unknown prop warnings on composed styled components.

How:

Move the declaration of spec to be before Styled is defined and check wether the first spec's tag is a string instead of just the tag.

Checklist:

• Documentation N/A
• Tests
• Code complete

This is also a bit smaller now. 🎉

[codecov-io]

Codecov Report

Merging #236 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   90.31%   90.26%   -0.06%     
==========================================
  Files          20       20              
  Lines         971      966       -5     
  Branches      263      261       -2     
==========================================
- Hits          877      872       -5     
  Misses         76       76              
  Partials       18       18

Impacted Files	Coverage Δ
src/react/index.js	100% <100%> (ø)	⬆️

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[tkh44]

This should fix factories as well! Awesome work.