Use NuGet directly from Travis and install NUnit.Runners in the install step

Author: asbjornu

.travis.yml

@@ -2,9 +2,8 @@ language: csharp
 solution: src/GitVersion.sln
 sudo: false
 install:
-  - mkdir -p src/.nuget
-  - wget -NO src/.nuget/nuget.exe https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
+  - nuget restore src/GitVersion.sln
+  - nuget install NUnit.Runners -Version 2.6.4 -OutputDirectory nunit
 script:
-	- mono --runtime=v4.0.30319 "src/.nuget/nuget.exe" Restore "./src/GitVersion.sln"
-	- xbuild "./src/GitVersion.sln" 
-	- mono --debug --runtime=v4.0.30319 ./src/packages/NUnit.Runners.2.6.4/tools/nunit-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll -nodots
+  - xbuild /p:Configuration=Debug "./src/GitVersion.sln" 
+  - mono --debug --runtime=v4.0.30319 ./nunit/NUnit.Runners.2.6.4/tools/nunit-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll -nodots