Html articles plain view

This PR returns HTML articles without JavaScript code that might break when TEAM Mentor content is displayed within an IFrame.
This PR looks great.

Can you just make a small change on this line

As you can see on https://github.com/TeamMentor/Dev/blob/master/Web%20Applications/TeamMentor.CoreLib/TM_AppCode/ExtensionMethods/TM_Xml_Database_ExtensionMethods_GuiHelpers.cs#L6

The idea is to have clean namespaces, so in this case the namespace should be just 'TeamMentor.CoreLib'