added MultipleSelectorVerifySelectionAfterSwitchingToAdvancedSettings test and refactoring of MultipleTagsSelector test and arrangement class
Merge branch 'MultiSelect' of https://github.com/Sitefinity/feather into MultiSelect

Conflicts:
	Tests/Telerik.Sitefinity.Frontend.TestUI.Arrangements/MvcWidgets/MultipleTagsSelector.cs
	Tests/Telerik.Sitefinity.Frontend.TestUI.TestCases/MvcWidgets/MultipleTagsSelector.cs