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Users can edit and delete individual cards from their deck

Users can now edit and delete cards from decks they have made. They cannot add or delete cards from other people's decks.
Merged alex's changes into my project

Merge branch 'master' of https://github.com/thejessleigh/sinatra-flash-cards-master
Merge pull request #8 from tararoys/master

Users can now edit their decks