Merge pull request #353 from yenatch/travis-allow-fail-formatting

travis: allow formatting job to fail instead of falsely reporting passed

.travis.yml

@@ -55,3 +55,5 @@ matrix:
       script:
         - ./build_tools.sh
         - make -j2 compare_ruby_de
+  allow_failures:
+    - env: _="Formatting"

.travis/check-git-clang-format-output.sh

@@ -17,5 +17,5 @@ if [ "$output" == "no modified files to format" ] || [ "$output" == "clang-forma
 else
     echo "clang-format failed:"
     echo "$output" | colordiff
-    exit 0
+    exit 1
 fi