Fix deprecation warning from Rails 3.2
Fix deprecation warning from Rails 3.2

mandarin6b0/rpush,kjnsn/rpush,rpush/rpush,rafal-radziszewski/rpush,amaierhofer/rpush,joshuairl/rpush,eleostech/rapns,krakatoa/rpush,zakwanhaj/rpush,zenjoy/rpush,jmnsf/rpush,chiu/rpush,rafal-radziszewski/rpush,ileitch/rapns,aried3r/rpush