add shoulda-matchers gem for tests
add migration for english_words
update to use shoulda-matchers
add basic tests for EnglishWord
add models for yale_words and english_yale_translations
update model and test for EnglishWord
add model and tests for YaleWord
add model and test for EnglishYaleTranslation
add some seed data
Merge pull request #6 from donal/models

Models