worker_node: fix hash key name
collector: fix error message spelling
api: refactor tweet.rabl
bundle update
clean code
web: sessions#create: fix user updating
app/web/api: refactor User#count_discovered_*
web: show "(dev)" if the environment is 'development'
web: tweets#import: use tweeter's tokens if tweet exists and user registered
web: refactor users#user_jump_suggest