refactor Tags.js and make some code to execute after ajax completes
remove tags even if the are in use
add some classes to hidden tags index forms to easy testing
href not needed in tags closing links
make capybara find hidden elements as well
add wait_for_dom new method for tests no to fail
tags-admin test suite refactor and green after jQuery duplication fixed
when destroying a tag, also destroy its items associations (taggings)