Try to move to the new Travis container based infrastructure.

.travis.yml

@@ -4,18 +4,12 @@ script:
     - cmake -DCMAKE_BUILD_TYPE=Debug test/ && make
     - ./unit/unit --gtest_filter='*.*'
 
-before_install:
-    #g++4.8.1
-    - if [ "$CXX" == "g++" ]; then sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test; fi
-    - sudo apt-get update -qq
-    # clang 3.4
-    - if [ "$CXX" == "clang++" ]; then sudo add-apt-repository -y ppa:h-rayflood/llvm; fi
-    - sudo apt-get update -qq
+addons:
+    apt:
+        sources:
+        - ubuntu-toolchain-r-test
+        packages:
+        - gcc-4.8
+        - g++-4.8
 
-install:
-    # g++4.8.1
-    - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
-    - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8"; fi
-    # clang 3.4
-    - if [ "$CXX" == "clang++" ]; then sudo apt-get install --allow-unauthenticated -qq clang-3.4; fi
-    - if [ "$CXX" == "clang++" ]; then export CXX="clang++-3.4"; fi
+sudo: off