updated unit test for new database client
refactored stanford utils to work with joblib, added readme
Tokenization is now done in advance before any of the experiments begin and cached using joblib in order to speed up training.

This is the only place where joblib caching is used. There is some code leftover from when I tried caching trained models, but that is too unreliable due to the large number of parameters each model has. These remaining bits of code will be removed in the future
changed all conf files so that joblib caching of tokenisation results is used