[travis] tmp disable llvm stuff

.travis.yml

@@ -10,15 +10,15 @@ addons:
     - ubuntu-toolchain-r-test
     - boost-latest
     - george-edison55-precise-backports
-    - llvm-toolchain-precise-3.7
+    #- llvm-toolchain-precise-3.7
     packages:
     - gcc-4.9
     - g++-4.9
     - gcc-5
     - g++-5
-    - clang-3.7
-    - clang-format-3.7
-    - clang-modernize-3.7
+    #- clang-3.7
+    #- clang-format-3.7
+    #- clang-modernize-3.7
     - cmake
     - cmake-data
     - doxygen