Hosting fails to read "wwwroot" if the project.json contains a JSON element that cannot be read by the JSON config source

[Praburaj]

We use the JsonConfiguration source to parse the project.json file to read wwwroot. When the project.json contains an JSON element that this configuration source cannot read it throws an exception and returns an incorrect wwwroot.

For example:
Have an authors element the project.json and wwwroot element. Hosting code here will fail to return the right wwwroot. It throws the following exception.
https://github.com/aspnet/Hosting/blob/dev/src/Microsoft.AspNet.Hosting/HostingUtilities.cs#L43

[Praburaj]

@Tratcher @davidfowl @ChengTian

[Praburaj]

Today nodes like code, exclude, resource and shared in project.json supports arrays. Which means any project.json with these will fail to work.
aspnet/dnx#133

There is a work item to remove support for string on these elements. aspnet/dnx#604