Add support for "--watch-poll" webpack-dev-server flag to ng serve

Please provide us with the following information:

OS?

Windows 7, 8 or 10. Linux (which distribution). Mac OSX (Yosemite? El Capitan?)
Ubuntu Trusty Tahr (14.04) [LTS] 64 vagrant guest OS on Windows 10 host.

Versions.

Please run ng --version. If there's nothing outputted, please run in a Terminal: node --version and paste the result here:
angular-cli: 1.0.0-beta.19-3
node: 6.4.0
os: linux x64

The file change detection isn't working with ng serve in vagrant on a Windows host. I've had the same issue using Browsersync and fixed it using "usePolling" in "watchOptions".
There is a similar configuration option in webpack.config.js but you can't edit that in angular-cli, so how about adding support for the "--watch-poll" flag to ng serve instead?

According to these comments "--watch-poll" should fix the issue:
webpack/webpack-dev-server#155 (comment)
webpack/webpack-dev-server#324 (comment)
http://stackoverflow.com/a/34937378

[filipesilva]

Fixed in #1814. There's no documentation for this feature though, which is unfortunate.

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