Specify the application base path in ConfigurationBuilder in beta8

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If we look at the source code of ConfigurationBuilder, we can see that the constructor no longer accepts a string representing the application base path. In stead, we have to use the SetBasePath() extension method on the IConfigurationBuilder interface to specify it:

public Startup(IApplicationEnvironment appEnv)
{
    var configurationBuilder = new ConfigurationBuilder()
        .SetBasePath(appEnv.ApplicationBasePath)
        .AddJsonFile("config.json")
        .AddEnvironmentVariables();

    Configuration = configurationBuilder.Build();
}

The particular commit can be found here.

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