Add some typescript definitions

[tarrow]

This is the minimal set of TS definitions currently required by TaintedReferences

[mariushoch]

Do we have a way to verify these against the JS code (make sure that all things we map out here actually do exist)? If not, I think this is fine as is.

[Ladsgroup]

Do we have a way to verify these against the JS code (make sure that all things we map out here actually do exist)? If not, I think this is fine as is.

It should doable now because of the webpack + karma system we built for testing.

[tarrow]

I think that the repo is currently lacking webpack; it also doesn't have typescript as a devDependency right now.

We could try and implement something for some crude testing but trying to avoid having to work around that was the main reason I didn't put this on DefinitelyTyped. I suggest we don't bother now. If we find that we're always adding types here some check that they are right would be smart though

[Ladsgroup]

I think that the repo is currently lacking webpack;

It doesn't ^_^ look at the karma.conf.js

[Ladsgroup]

the test can be done later.