Move @types to package.json dependencies for definitions and add missing @types

[sheldonkwok]

We need the module's dependency's types in the dependencies part of the package.json for typescript to see them. More reasoning can be found here: microsoft/types-publisher#81

[sheldonkwok]

I just signed up for the CNCF CLA but I'm not sure how to retrigger w/o another commit.

Edit: I guess this comment works.

[sheldonkwok]

Adding the @types to the dependencies itself didn't work. I ended up having to add new @types and change code.

[sheldonkwok]

Closes #37

[brendandburns]

LGTM, thanks.