Clean the associated tweets when a 'term' is deleted by the user

[memaker]

When a 'term' is deleted, we shall delete all its associated tweets

[memaker]

I have added this code to the 'term' controller

DELETE /terms/1

DELETE /terms/1.json

def destroy @term = Term.find(params[:id])

## it also deletes the associated tweets
@tweets = @term.tweets
@tweets.destroy_all

@term.destroy