Adding dependencies to directives

So I've noticed that I never declared proper angular dependencies for most of the directives. I found an interesting problem though. The module `foundation.common.directives` is full of helpers that do not necessarily have to be used and thus I didn't list them as dependencies; however, I think that most users would expect them to work as in the demo (such as `fa-open` not opening a modal) but for anyone creating their own app, I think I can just document this.