Display all existing tags on their index page
Display only tagged items on the tag page
Test filtering items by two tags simultaneously
Load and display all existing tags in all actions
Filter items by INNER JOINing tags multiple times
Display all selected tags on the show page
Select & show filtered items via Item#tagged_with
Link each tag to new set of selected tags
Mark selected tags with a special class "selected"
Prettify pages with tags
Test that clicking a selected tag unselects it
Prettify tag filter specs
Merge pull request #34 from vassilevsky/feature-9-filter-by-tags

Feature #9 - Filter items by tags