rename run_model ==> run_model_data_file.
Purge unused method run_model_data_file
Purge private unused method.
Clean up code and make methods private.
Merge branch 'master' of github.com:berkmancenter/mediacloud
fix bugs causing empty stories.story_tags field not to be displayed and causing story_sentences.tags field never to be displayed
Merge branch 'master' of github.com:berkmancenter/mediacloud