Not showing webpack compilation warnings

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

@angular/cli: 1.3.0-rc.3
node: 6.11.1
os: win32 x64
@angular/animations: 4.3.1
@angular/cdk: 2.0.0-beta.8
@angular/common: 4.3.1
@angular/compiler: 4.3.1
@angular/core: 4.3.1
@angular/forms: 4.3.1
@angular/http: 4.3.1
@angular/material: 2.0.0-beta.8
@angular/platform-browser: 4.3.1
@angular/platform-browser-dynamic: 4.3.1
@angular/platform-server: 4.3.1
@angular/router: 4.3.1
@angular/service-worker: 1.0.0-beta.16
@angular/cli: 1.3.0-rc.3
@angular/compiler-cli: 4.3.1

Repro steps.

After upgrading to 1.3.0-rc.3 and doing some bad things, ng serve outputs:

webpack: Compiling...
webpack: Compiled with warnings.

But no warnings are printed 😞

(I encountered the issue with there changes, but any changes creating warnings should do.)

The log given by the failure.

N/A

[Matmo10]

@filipesilva @hansl Could this be made configurable at all?

I have lots of the fake errors stemming from https://github.com/angular/angular-cli/issues/2034, and I actually enjoyed having the warning output rather limited.

Not only did you guys bring back the first line of the warnings (how it use to be), but you also added the whole stack traces as well. So now I have a giant wall of stack traces every time I make a change.

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