Have added JsMockito to DefinitelyTyped

[shiver-me-timbers]

Hi,

I've sent a pull request through to the DefinitelyTyped project that adds the 1.0.4 JsMockito library definitions.

Was wondering if you would like to review it?

I've done this to allow better auto-completion in Intellij through the use of the TypeScript community stubs.

I'm not exactly an expert JavaScript developer and this is the first time I've ever used TypeScript so would be good to have some other eyes cast over it :)

Cheers.