Language services hard-codes newline to \r\n

[csnover]

services/services.ts createCompilerHost function hardcodes getNewLine to "\r\n" instead of providing a way for the LanguageServiceHost to define it (or at least using ts.sys.newLine).

Refs #372.

[nycdotnet]

@mhegazy Would you consider a PR to add this to tsc? We've gotten requests for this in grunt-ts, and we don't currently have a way to support it without tsc supporting it directly. Thanks.

[mhegazy]

We already have an issue for it #1693. Looks like we need a new compiler flag for it. PR welcomed. I have no good ideas for the name though... --newLine \n or --newLine CRLR / LR.