TypeScript: Add recursive array type to CSS prop

[quicksnap]

What:

Fixes the type definitions for css prop. The css prop actually accepts either an object or an array of nested objects/arrays.

Why: TypeScript support

How: Leverage recursive types described in this comment: https://github.com/Microsoft/TypeScript/issues/3496#issuecomment-128553540

Checklist:

• [ ] Documentation N/A
• [x] Tests
• [x] Ready to be merged
• [ ] Added myself to contributors table

The build fails due to previous failure. I have PR #382 that fixes this.

[quicksnap]

Example of how the current typings would fail:

<Div css={[ { fontSize: 40 }, [ { fontSize: 50 } ] ]} /> Would throw a TS error

[Ailrun]

@quicksnap Could you rebase (or merge, or whatever to sync with master) this PR?

[quicksnap]

Done. Hopefully all passes now? =)

[quicksnap]

In order to automate release, should I adjust my commit message or something?

[kentcdodds]

When you click "Squash and merge" you'll see this which allows you to change the commit message of the squashed commit:

[codecov-io]

Codecov Report

Merging #383 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #383   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines         182    182           
  Branches       52     52           
=====================================
  Hits          182    182

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