added models for address, chain, event, tag, user
installed devise for user login
implemented preliminary chain_controller functionality: index, show, new, update
tested chain - user associations in app
got a bit off track, commiting a bunch of random stuff
got a bit off track, commiting a bunch of random stuff
implemented basic admin and member roles for creating/managing chains
added nested forms
installed Nested_forms gem and deployed preliminary js functionality on form elements