Regression: separated config for index.html source and output

[ishitatsuyuki]

angular-cli: 1.0.0-beta.21 patched webpack config to support pug
node: 7.2.0
os: linux x64
The patch is simply a dirty version of #2205.

I have configured like this so pug is compiled:
"index": "index.pug"
However, this also changes the output extension, which not only doesn't make sense but also breaks development server(ng serve).

Random notes:
webpack dev-server seems to have index.html hardcoded, and it's the default for most static servers too.

[filipesilva]

That kind of support needs to come in #2205 really. It doesn't make a lot of sense to have it otherwise.

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