Add requeriments file.
Add script to download SIGHAN's 2005 Bakeoff data.
Add command line behaviour to shenmeci.py

Take input from file or stdin, segment words and then write to a file or stdout.
Add script to evaluate the segmenter
Ignore data from backoff, should not be commited.
Change initial value of CEDICT.vocabulary to be a dict.

The futher initialization code set's it to a new dictionary, therefore for code clarity we declare an empty dict.
Improve compute_score script to compute scores in all datasets.
Add option to learn from an external source of words.
Rename attribute vocabulary -> dictionary.

Dictionary is a better word for what a WordTranslator expects.
Vocabulary is a list of words.