fix(webpack): Added ContextReplacementPlugin to remove ng test warning

[delasteve]

Fixes #2359

@TheLarkInn: This is my first time working with webpack. Please let me know if there is anything else I need to do. It appears to have fixed the issue I was seeing with my project.

[JohannesRudolph]

Looks like the appveyor build failed for an unrelated reason. Can anyone investigate/confirm?

[JohannesRudolph]

I can confirm this fixes #2359 but it does not fix #2364

[TheLarkInn]

This looks good to me. @hansl not sure what the AppVeyor flaking out was for on one test.

[delasteve]

@TheLarkInn / @hansl - It appears it was just a flaky test. I rebased last night and now all tests pass.

Let me know if there is anything else you would like me to do.

[TheLarkInn]

Branch is out of date, this looks good so far, but I'd like to make sure with the most recent changes that this still passes.

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