initial work on facebook login

directs to facebook login correctly but the callback handler does not function propertly
OmniAuth::Strategies::OAuth2::CallbackError
working facebook auth hack

store facebook user data as part of UserData after login
hardcoded application id and secret

resources: https://github.com/mkdynamic/omniauth-facebook/issues/75
http://railscasts.com/episodes/360-facebook-authentication?view=asciicast
add fb_uid to UserData model
Merge branch 'feature-2-2-eunson' into iteration-2-1

Conflicts:
	app/views/templates/widgets/_calendar_events.html.erb
Merge branch 'iteration-2-1' of github.com:dtscraft/calcentral into iteration-2-1