Prettier error messages

[blakeembrey]

Let's see what can be done with microsoft/TypeScript#5140, otherwise let's think about it more.

Also relevant: http://flowtype.org/blog/2015/10/07/Version-0.17.0.html

Edit: https://github.com/Microsoft/TypeScript/blob/d5d7a2a2dc50e07d67547e81cde34c2e4d7c0bae/src/compiler/tsc.ts#L410

[atian25]

hey, @blakeembrey any plan on this ?