NH-3900 - Install NUnit.Console NuGet package

Author: hazzik

Tools/.gitignore

@@ -1 +1,2 @@
 nuget.exe
+NUnit.*

Tools/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="NUnit.Console" version="3.6.0" />
+</packages>

build-common/common-project.xml

@@ -57,6 +57,9 @@
 			<arg value="restore" />
 			<arg value="NHibernate.sln" />
 		</exec>
+		<exec basedir="${tools.dir}" workingdir="${root.dir}/Tools" program="NuGet.exe">
+			<arg value="install" />
+		</exec>
 	</target>
 
 	<target name="common.compile-all" depends="common.generate-assemblyinfo common.nuget-restore">