Failing tests for query args
Transform `tag` into `post_tag` for cleaner endpoints
Fix tests - we're forgetting `filter` ever existed
More comprehensive tests
Support `order` and `orderby` args
More specific method
Tests for searching terms
Support defining description and slug when inserting term
Pass prepared term through a filter

This will make it easier for users to modify response values
Return embedded reference when term has a parent
Merge pull request #696 from WP-API/650-terms-cleanup

Clean up Terms controller