Remove Clang from Travis while llvm.org is having problems.

See mapbox/mapbox-gl-native#1828

.travis.yml

@@ -7,7 +7,7 @@ node_js:
 
 env:
   - CC=gcc-4.8 CXX=g++-4.8
-  - CC=clang-3.6 CXX=clang++-3.6 npm_config_clang=1
+#  - CC=clang-3.6 CXX=clang++-3.6 npm_config_clang=1
 
 before_install:
   VER=`npm --version` eval 'ARRAY=(${VER//./ }) && if [ ${ARRAY[0]} -lt 2 ] || ( [ ${ARRAY[0]} -eq 2 ] && [ ${ARRAY[1]} -lt 13 ] ) ; then npm install -g npm; fi'
@@ -16,15 +16,8 @@ addons:
   apt:
     sources:
       - ubuntu-toolchain-r-test
-      - llvm-toolchain-precise-3.6
+#      - llvm-toolchain-precise-3.6
     packages:
       - gcc-4.8
       - g++-4.8
-      - clang-3.6
-
-matrix:
-  allow_failures:
-    - env: CC=clang-3.6 CXX=clang++-3.6
-      node_js: "0.10"
-    - env: CC=clang-3.6 CXX=clang++-3.6
-      node_js: "0.12"
+#      - clang-3.6