add sessions controller for create_session and logout paths
add sessions controller for create_session and logout paths

grapefruitricky/surveysfordayz,nyc-dragonflies-2015/surveysfordayz-demo,nyc-dragonflies-2015/surveysfordayz-demo,arosswilson/surveysfordayz,arosswilson/surveysfordayz,grapefruitricky/surveysfordayz,arosswilson/surveysfordayz,nyc-dragonflies-2015/surveysfordayz-demo,grapefruitricky/surveysfordayz