tidy Gemfile to avoid error messages
add tag events feature branch for branch
add tag model test
update event model specs
create event_tag model spec
update associations in model specs
migrate new models, create classes, pass model tests
pass feature test for branch
remove dummy mailer spec clutter
update shoulda matcher stubs to remove deprecation warnings
add example tags to seed file for searching
update db schema file
add hash to tags as placeholder
add new tag specs for show-all-tags partials where tags are clickable

Now the show-event page for single event should eventually have a list
of all available tags for adding to the visible event.
tidy up routes file
pass tags controller spec to show all available tags
amend clickable tags feature test to find non link tag texts
auto add whitespace to tag controller
update Event tag specs and mark buggy ajax feature test pending
pass updated EventTag model test