Updated Admin Panel for Holiday Request

Added Buttons for Accept/Reject Requests.
Seperating different views of Requests
Merge remote-tracking branch 'origin/master'

Conflicts:
	Holiday-App/Views/Shared/_Layout.cshtml
	Holiday-App/obj/Debug/DesignTimeResolveAssemblyReferencesInput.cache
	HolidayApp.Core/Data/HolidayAppDb.cs