Another ubuntu travis attempt.

.travis.yml

@@ -6,10 +6,6 @@ branches:
     - develop
     - feature-travis
 
-compiler: 
-  - gcc
-  - clang
-
 os:
 - linux
  
@@ -42,23 +38,6 @@ matrix:
           packages:
             - g++-4.9
       env: COMPILER=g++-4.9
-    - compiler: gcc
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - g++-5
-      env: COMPILER=g++-5
-    - compiler: clang
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.6
-          packages:
-            - clang-3.6
-      env: COMPILER=clang++-3.6
     - compiler: clang
       addons:
         apt: