Update spec to reflect nested resources.
Use nested resources in tag spec. Correct link_to calls in view.
Update #index to reflect nested resource
Add Pry gem
Update #index to use nested resources
Add navbar to 'tags' index view
set_tag before_action
Update #edit for nested resources
set_tag redirects to :index when no tag is found
update action as nested resource
Feature spec - edit tag
Feature spec - delete tag
Update destroy action for nested resources
Feature spec - add a tag
Update tag create action for nested resource