renamed services with "Service" suffix
Added applicationCtrl.js and updated app.js and index.html to use this top level controller
added authService, sessionService, login.html partial and loginCtrl to handle authenitating a user. Also app was commited in last commit but there were some additions (constants) that relate to the auth process
updated expeditionEditCtrl and expeditions services to create a new expedition. Still need to figure out how to send the session variable with the request or if every request is going to be authorized with username/password