2.1.10

A clean checkout of this project would no longer build because the
packages.config file was removed (which happens when you remove all
packages from a project).

I installed specific versions of the dependencies using the PowerShell
console

  Install-Package log4net -Version 1.2.10
  Install-Package NUnit -Version 2.6.2
1.2.11

According the the following post there was a signing change between
log4net versions 1.2.10 and 1.2.11 which caused problems

http://devlicio.us/blogs/krzysztof_kozmic/archive/2012/01/31/how-to-force-nuget-not-to-update-log4net-to-1-2-11.aspx

I updated to the (hopefully) fully compatible 1.2.11