Fixes icon issue with TreeList Overview example.
Fixes icon issue with TreeList Overview example.

On themes not supporting the Font Awesome natively, now code is added to
reference a standalone installation of the theme in the EE project.

Related github issue: extnet/Ext.NET.Examples.MVC#9.

extnet/Ext.NET.Examples.MVC,extnet/Ext.NET.Examples.MVC,extnet/Ext.NET.Examples.MVC