Conflicts:
	src/compiler/emitter.ts
	src/compiler/parser.ts
	src/compiler/program.ts
	src/services/services.ts
	tests/cases/unittests/transpile.ts

…TypeScript into whitneyit-feature/noEmitExtends

This PR is a Work In Progress that addresses multiple `__extends`
being output as described in #1350: Multiple `__extends` being output
when `--module amd` is set.

The issue still exists as of `v1.5.0 - f53e6a8`.

Apparently a fix was created for this in #1356 but according to #2009, a
[comment](#2009 (comment))
later indicated that this was never merged in.

Further conversation continued in #2487 but did not yield any result. I
refer to my earlier recommendation in #1350.

> My question is this, would the TypeScript team be open to a flag that
> can be passed to tsc that will generate something like the following
> ```ts
> define(["require", "exports", "__extends", './mammal'], function (require, exports, __extends, Mammal) {
>     var Human = (function (_super) {
>         __extends(Human, _super);
>         function Human() {
>             _super.apply(this, arguments);
>         }
>         return Human;
>     })(Mammal);
>     return Human;
> });
> ```

To continue with the naming convention I have chosen the flag
`--noEmitHelpers`.