Add NuGet packages

Author: govert

MasterSlave/Slave/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="ExcelDna.AddIn" version="0.34.0-dev38" targetFramework="net45" />
-  <package id="ExcelDna.Integration" version="0.34.0-dev38" targetFramework="net45" />
+  <package id="ExcelDna.AddIn" version="0.34.1-beta" targetFramework="net45" />
+  <package id="ExcelDna.Integration" version="0.34.1-beta" targetFramework="net45" />
 </packages>