WIP Fix tests for Typescript 2.1

[soda0289]

Fixes tests for issue #128

I'm still looking into this. Thought I would post some initial progress. Any feedback is appreciated.

[eslintbot]

Thanks for the pull request, @soda0289! I took a look to make sure it's ready for merging and found some changes are needed:

• The commit summary needs to begin with a tag (such as Fix: or Update:). Please check out our guide for how to properly format your commit summary and update it on this pull request.

• Pull requests with code require an issue to be mentioned at the end of the commit summary, such as (fixes #1234). Please update the commit summary with an issue (file a new issue if one doesn't already exist).

Can you please update the pull request to address these?

(More information can be found in our pull request guide.)

[eslintbot]

Thanks for the pull request, @soda0289! I took a look to make sure it's ready for merging and found some changes are needed:

• The commit summary needs to begin with a tag (such as Fix: or Update:). Please check out our guide for how to properly format your commit summary and update it on this pull request.

• Pull requests with code require an issue to be mentioned at the end of the commit summary, such as (fixes #1234). Please update the commit summary with an issue (file a new issue if one doesn't already exist).

Can you please update the pull request to address these?

(More information can be found in our pull request guide.)

[JamesHenry]

Thanks a lot for starting work on this, @soda0289!

I found it very useful when adding TS 2 support, to first research and map out all the relevant changes on the issue, before submitting any PRs (#105).

Let's work together on that for this TS 2.1 work by using the existing issue here #128 and we can get a PR with the updates merged ASAP.