changes to controllers and routes to mimic the Trello architecture
adds catagory#new
adds checklist model, to mimic Trello architecture. BIG changes going on here
strips card edit to resemble the Trello Card
adds checklist form
adds checklist_item adding
removes large commented transaction and code in CardsController
removes unused board views. it is unlikely this app will use backbone
removes cards#show as it is not going to be used