Disable injecting manifest into chunks.

[sunyang713]

Addresses #47, #48, #49, #50.

[mbrevda]

@diurnalist would this patch work?

[chaffeqa]

I can confirm this fixes at least my dev env

[chaffeqa]

Update here, that line is actually required when using NamedModulesPlugin.

I think the solution is to combine #37, #53 and change this to:

if (!inlineManifest) {
    chunk.files.push(manifestFilename);
}

Edit: I think jouni-kantola/inline-chunk-manifest-html-webpack-plugin#17 (comment) is dependent on this FYI