build(@angular/cli): add option to ignore files

[redbmk]

Let the webpack dev server ignore files specified by the user
as either the --ignored command line option or through the
defaults.build.ignored option in the configuration file

This fixes #2425 and allows for a way to fix #4593.

TODO:

• Fix e2e test. The built code seems to work in practice, but not in the test environment.

[filipesilva]

#4593 is fixed by #7310. I think an ignore list is no longer required since now only files in the compile list will be watched.

[redbmk]

@filipesilva yeah, it looks like those changes do indeed fix the vim issues I was having without needing to specifically ignore those files. I had started working on this before Thursday when those changes were merged. The already-merged code is way simpler!

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