Remove CATALOG_OPTIMIZATION_DISABLED=true from tests

This isn't necessary.

.travis.yml

@@ -28,7 +28,7 @@ before_script:
   - firefox -v
 script:
 - bin/code-analysis
-- CATALOG_OPTIMIZATION_DISABLED=true bin/test
+- bin/test
 - bin/pylint --py3k --disable=no-absolute-import src/collective/nitf
 after_success:
 - pip install coverage