Add tests to ensure verb conjugation JSON includes the tense and subject, to cover fake subject requests, and to cover requests for a subject list for a fake language.
Make conjugation objects aware of their tense and subject (if any)
Updates to Gemfile. Also remove Gemfile.lock from .gitignore, which apparently is a faux-pas.
Update README with information on subjects, and a new way to install dependencies (with bundle rather than gem install).
Fix typo in text description.
Revert bug inducing change to the conjugation code.