friend list  work in progress
Merge branch 'feature-friend-list' into style-branch-JM

Conflicts:
	app/controllers/events_controller.rb
	app/models/event.rb
	app/views/events/_list_item.html.haml
add Gemfile.lock for deployment
convert to string when Event.find_by_facebook_id

this problem does not happen for sqlite

but postgres complains:

PG::UndefinedFunction: ERROR:  operator does not exist: character varying = bigint
LINE 1: ...ts".* FROM "events"  WHERE "events"."facebook_id" = 35267328...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT  "events".* FROM "events"  WHERE "events"."facebook_id" = 352673288199808 LIMIT 1