Update TypeScript typings

[corbinu]

I merged in my typings and updated for the new use of async/await.

I also removed the Expect typings. They can be added back in however given that other assertion libraries can be used I think there are two better options:

1. Currently I simply import expect from code separately and then use the @typings/code package. I have some enhancements I can simply commit to there.
2. We could merge typings into code as well and import those.

Would love to get peoples thoughts on which is better

[geek]

@corbinu I'd vote for 2 to get the code typings in.

[lock]

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