Global config not updating when user or default config changes

[areyling]

This is shown when running the ManualDefaultAndUserConfig unit test together with CurrentScopeTest, before bfb1f4d.

When executed separately both will pass, but when ran together the line:

dynamic c = Config.GetCurrentScope ();

will initialize the global config object, causing it to be an outdated merge of the user/default configs after they're set in the set up of ManualDefaultAndUserConfig:

Config.SetUserConfig (parsed.Fruits);
Config.SetDefaultConfig (parsed.Vegetables);
//...
dynamic scope = Config.Global; //no longer up-to-date

[areyling]

After bfb1f4d, running ManualDefaultAndUserConfig individually will cause the test to fail (Length is 7 instead of 1; when ran together with CurrentScopeTest, Length is 1 instead of 7).