Update TS version in the Playground

[agentcooper]

Judging by the console output:

ts.version: 2.1.4-insiders.20161201

Took me a while to find out that not the latest version is used.

Any blockers in updating to 2.3.3?

[mhegazy]

Should be on 2.3 now. will need to update it to 2.3.3

[mhegazy]

should be on 2.3.3 now.