[rsvp] RSVP functionality

- create grunt tasks: jshint, concat, uglify, compass, connect, watch
- ignore node_modules
- update read me
- rollbar js for error checking
- lodash.js for templating
- firebase.js for BaaS
- scroll to top
- validation
- update zurb to latest 4.x
- add heap analytics
- cssmin
- linting