Generated Tag scaffolding.
Add bookmark link list to tag show view.
Add tags to route; show bookmarks in tag view.
Tag index should show tag names
Add tag links to index.
Tags shouldn't appear if empty of bookmarks.
Expect Tag.with_bookmarks to omit bookmarkless tags.
Get tags only with bookmarks.
Deleted a boilerplate test.

The coverage for this test is present in a feature spec.
Add with_bookmark query to Tag.

Filters out tags that have no associated bookmarks.
Removed unnecessary actions from controller.
Removed unnecessary TagController actions.

Tags should not be directly manipulated.
Removed dead actions from routes.

Also deleted a link from the sites index view to SitesController#new
Sites index view now mirrors Tags index.