License for Text plugin

Author: Twenty57

This plugin incorporates third party components whose licenses require us to include the license and/or copyright notices. Here are those licenses:

• GongSolutions: https://raw.githubusercontent.com/punker76/gong-wpf-dragdrop/develop/LICENSE
• AvalonEdit: http://opensource.org/licenses/MIT
• RazorEngine: https://github.com/Antaris/RazorEngine/blob/master/LICENSE.md
• Microsoft.AspNet.Razor: http://www.microsoft.com/web/webpi/eula/net_library_eula_enu.htm
• Twenty57 plugin