Tracking: Lower Install Time.

[hansl]

• Fork CompressionPlugin and remove Zopfli dependency.
• Make Sass Loader not directly depend on node-sass and install it only if/when needed.
• Remove direct dependency to protractor and show error message when ng e2e is run but protractor isn't in node modules.
• Remove direct dependency on karma and show an error message when ng test is run but karma isn't in node modules.
• Drop bootstrapping time down to under 1 seconds on Travis (or in e2e in general).

[hansl]

Forking CompressionPlugin happened in #3414.

[hansl]

Cleaned up the package json and made a script to make sure we always depends on the exact dependencies, not more or less.

[Bulan]

I was about to create a new issue about not able to install since node-gyp requirement requires the server to access something other than npmjs.com (which our build server is locked down to only allow access to).

But found this #3428 the lead me here, so how far along is the "remove sass loader", any ETA since it seems to be next on the list?

[hansl]

Closing this as done;

1. we will not remove dependencies on protractor and karma before 1.0
2. the sass-loader plugin is useful for most people and the main users having problems (Chinese developers behind the firewall) can now use cnpm to install.

The install time went down significantly, and we have support for yarn as well which reduces further time.

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