Move webroot:wwwroot from project.json to Microsoft.AspNet.Hosting.json

[Tratcher]

https://github.com/aspnet/Templates/blob/dev/src/BaseTemplates/EmptyWeb/project.json#L2
Microsoft.AspNet.Hosting.json:

{
  "Hosting:WebRoot": "wwwroot"
}

Or

{
  "Hosting":
  {
     "WebRoot": "wwwroot"
  }
}

@DamianEdwards? I don't recommend promoting WebRoot to a top-level element.
aspnet/dnx#3035
aspnet/Hosting#411

[Tratcher]

@davidfowl

[rustd]

@Tratcher rc1?

[Tratcher]

Yes, rc1

[phenning]

This has some tooling impact as well.

[phenning]

/cc @BillHiebert

[Tratcher]

Feedback: remove the Microsoft.AspNet.Hosting.json file from the default templates. The runtime uses intelligent defaults and the file is only needed for customization.

[scottaddie]

The gulpfile.js file included in the StarterWeb template will need to be adjusted accordingly. It currently pulls in the project.json file via require and then accesses its webroot property.

[rustd]

@Tratcher Let's remove the file if the runtime has defaults. The gulpfile will have to be updated to hard code wwwroot as a path.
@Tratcher are you reverting your change?

[Tratcher]

I'll take care of the updates today