add API and Deck models and refactor to use them
add card location to return value
Merge branch 'dev' into feature/card-deck-api
fix missing form attribute for files
Merge branch 'dev' into feature/card-deck-api
no card model yet
remove debugging
update readme
fixed broken specs and added spec for deck
added deck spec
added api spec
moved to subdir
Merge pull request #53 from Harvard-ATG/feature/card-deck-api

Feature/card deck api
Merge branch 'dev' into feature/instructor-interface