$ git clone
$ virtualenv --no-site-packages twdump_sandbox
$ cd twdump_sandbox/ && source bin/activate
$ pip install -e ../twdump
$ python -c "import nltk;nltk.download('maxent_treebank_pos_tagger');"
$ python -m twdump.run
...
$ deactivate
$ cd .. && rm -rf twdump_sandbox
$ rm -rf ~/nltk_data