Make functional test for term_categories with edit and change_order action
Make functional test for term_categories. Remove unuse test file
Make unit test for Term
Make unit test for GlossaryStyle
Add unit test for term_category
Fix unit tests' fixture, remove unexist table(model)'s test
Add plugin's fixtures directory to read fixtures on test
Fix test_helper relative path
Original plugin from r-lab, redmine_glossary version 0.6.1