remove clang from travis build for now https://github.com/travis-ci/travis-ci/issues/6120#issue-157861834

.travis.yml

@@ -24,14 +24,6 @@ matrix:
           packages: ['g++-5', 'valgrind']
       env: COMPILER=g++-5
 
-    - os: linux
-      compiler: clang
-      addons:
-        apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
-          packages: ['clang-3.6', 'valgrind']
-      env: COMPILER=clang++-3.6
-
 script:
   - mkdir build && cd build
   - cmake -G "Unix Makefiles" -D SHARED=1 -D TESTS=1 -D CMAKE_CXX_COMPILER=$COMPILER ..
@@ -52,5 +44,3 @@ after_success:
 
 notifications:
   email: false
-
-