Option to turn off progress logging

[NickClark]

1. OS? Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
   Any

2. Versions. Please run ng --version. If there's nothing outputted, please run
   in a Terminal: node --version and paste the result here:
   1.0.0-beta.11-webpack.8

3. Repro steps. Was this an app that wasn't created using the CLI? What change did you
   do on your code? etc.
   Stock CLI app. Run ng build. See progress.

4. The log given by the failure. Normally this include a stack trace and some
   more information.

5. Mention any other details that might be useful.
   This is mostly for running builds as part of a CI. Logging makes a mess and doesn't work properly when displayed outside of a terminal. Normally when using straight webpack, you'd just pass along the --no-progress option.

   ---

   Thanks! We'll be in touch soon.

[victornoel]

+1 because it is really bothering when ng build is run in continuous integration