build(): add TSD definitions.

[hansl]

npm install automatically pull the .d.ts.

[hansl]

@jelbourn:

The test failed because we hit github rate limit :/

[hansl]

Review the code but I'll check with Alex on Monday what's the best approach here. Basically we won't be able to use tsd on travis without using a github auth token.

[hansl]

This isn't needed to move forward, we can revive it if we need it.

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