Improving User Suite Reports

[DanielRosenwasser]

A few months back, @amcasey had put together some great infrastructure for detecting breaks introduced by TypeScript on a weekly basis. That infrastructure creates new issues with a clean readable summary for us to review every Monday.

We would like to get the same sort of printout for user test suites and possibly RWC ("real world code") test suites as well, which have the following properties:

• Lots of noise generated by build output to diff every single time.
• RWC test results seem opaque - you don't get feedback if they pass

[DanielRosenwasser]

The new command is user test this inline and is documented at https://github.com/microsoft/TypeScript/wiki/Triggering-TypeScript-Bot

RWC changes are still opaque, so I'll leave this open.