Wait a while before exiting travis to allow output to flush.

.travis.yml

@@ -124,6 +124,8 @@ before_install:
     fi
 
 before_script:
+  # Wait a while for output to flush :(
+  - onexit() { sleep 20; }; trap onexit 0
   - mkdir -p build || (echo "Failed to mkdir build" ; false)
   - cd build || (echo "Failed to cd build" ; false)
   - cmake .. || (echo "Failed to run cmake"; false)