Merge pull request nunit#787 from akoeplinger/travis-csharp

Use Travis CI C# support instead of installing Mono from a PPA

.travis.yml

@@ -1,17 +1,14 @@
-before_install:
-  - sudo add-apt-repository ppa:directhex/monoxide -y
-  - sudo apt-get update -qq -y
-  - sudo apt-get install mono-devel -qq -y
-  - yes | sudo certmgr -ssl -m https://go.microsoft.com
-  - yes | sudo certmgr -ssl -m https://nugetgallery.blob.core.windows.net
-  - yes | sudo certmgr -ssl -m https://nuget.org
-  - sudo mozroots --import --machine --sync
+language: csharp
+sudo: false
+mono:
+  - latest
+  - 3.2.8
 
 before_script:
   - xbuild NUnit.proj /p:Configuration=Release /p:Framework=$Framework "/t:DumpSettings"
 
 script: 
-  - ./tools/nuget.exe restore nunit.sln
+  - mono ./tools/nuget.exe restore nunit.sln
   - xbuild NUnit.proj /p:Configuration=Release /p:Framework=$Framework /t:$Targets
 
 env: