AtataContext global configuration

[YevgeniyShunevych]

Add a property to AtataContext:

public static AtataContextBuilder GlobalConfiguration { get; }

Global configuration should be static and applied as a base configuration settings to all other test-specific configurations. When AtataContext.Configure() method is invoked, BuildingContext of GlobalConfiguration should be copied to new AtataContextBuilder instance. It is good to set up common AtataContext settings as a global configuration once in one-time set-up method.

Usage

[OneTimeSetUp]
public void GlobalSetUp()
{
    AtataContext.GlobalConfiguration.
        AddNUnitTestContextLogging().
        UseNUnitTestName();
}

[SetUp]
public void SetUp()
{
    AtataContext.Configure().
        UseChrome().
        Build();
}