Use floating alias for Rubinius and JRuby.
Use floating alias for Rubinius and JRuby.

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