Support JSX syntax

[adidahiya]

It's probably just as simple as renaming the file to file.tsx:

tslint-playground/src/linter.ts

Line 38 in e625663

const sourceFile = getSourceFile("file.ts", source);

[johnwiseheart]

JSX would be nice. I had a look at just renaming the file, but with this code:

const a = <div>Test</div>;

ran into some issues with the built-in typescript compiler not knowing what div actually is. This thread seems pretty relevant here - it was pretty easy to get JSX to work without validation by just disabling validation but thats not so nice. Might come back to this but would certainly accept a PR if anyone feels like it.