Download official binary for Nuget and call it from Mono on Travis.

.travis.yml

@@ -17,9 +17,10 @@ install:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list; fi
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list; fi
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get update -qq; fi
-  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get install -y mono-devel nuget p7zip-full; fi
-  - nuget install NUnit -Version 2.6.4 -OutputDirectory deps
-  - nuget install NUnit.Runners -Version 2.6.4 -OutputDirectory deps
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then sudo apt-get install -y mono-devel p7zip-full; fi
+  - wget https://nuget.org/nuget.exe
+  - mono nuget install NUnit -Version 2.6.4 -OutputDirectory deps
+  - mono nuget install NUnit.Runners -Version 2.6.4 -OutputDirectory deps
   - cp deps/NUnit.2.6.4/lib/nunit.framework.* deps/NUnit/ 
   - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   - wget -O llvm_linux_x86_64.7z https://www.dropbox.com/s/zxigif3vghsdfli/llvm_linux_x86_64.7z?dl=0