Code format check: Just generate warnings.

Author: StefanOberhumer

.travis.yml

@@ -27,7 +27,7 @@ before_install:
   - |
     if [ "$TRAVIS_OS_NAME" = linux ]; then
       echo "Checking format of sourcecode..."
-      find . -type f -name '*.cpp' -print0 -name '*.h' -print0 | xargs -r0 ./scripts/check_code_format.py --all
+      find . -type f -name '*.cpp' -print0 -name '*.h' -print0 | xargs -r0 ./scripts/check_code_format.py --all --warn
     fi
   - |
     if [ "$TRAVIS_OS_NAME" = linux ]; then