feat: Implementation of flag to install Angular Material on new or init

[marc-sensenich]

Added --material flag onto the new and init features for the core setup of Angular Material

fixes #884

[metric152]

this is pretty cool. nice feature add.

[filipesilva]

@hansl can you have a look?

[JohannesHoppe]

Great idea. 👍
But I tried this out and I don't see a big benefit (for now).

According to the "Getting Started Guide" (https://github.com/angular/material2/blob/master/GETTING_STARTED.md) only step 1 to 3 are done.

There are more steps to do:

• I still need to install the componentes by hand (eg. npm install --save @angular2-material/{button,card}
• vendorNpmFiles copies only *.js files, it should copy everything
• Main file for the packages are not configured.
  materialPkgs.forEach((pkg) => { packages[@angular2-material/${pkg}] = {main: ${pkg}.js}; });

For the sake of simplicity I would install all components by default...

[JohannesHoppe]

All my suggestions as a diff:
https://github.com/Angular2Buch/angular-cli-material-flag/commit/a53de8f45fee20db78cfb2786f1deb44792d2454

... works like a charm! Thanks @marc-sensenich 😄

[filipesilva]

Closed as this PR was made obsolete by #1455.

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