use only_once in a few more places
use only_once in a few more places

carck/async,jaruba/async,sjclijie/async,rborisov/async,tjwudi/async,modulexcite/async,renruixi/async,chaddm/async,DaAwesomeP/async,r14r/fork_javascript_async,r14r-work/fork_javascript_async,ezubarev/async,lonely8rain/async,markyen/async,zhakui/async,LeoYao/async,DanieleTassone/async,zhhb/async,ariesnah/async,Kikobeats/async,Zhang/async,ezubarev/async,rborisov/async,arigo-software/async,ariesnah/async,garysye/async,rlugojr/async,abhishekgahlot/async,tjwudi/async,ibakaidov/async,kolomiichenko/async,XM-Right/async,sjclijie/async,Segeon-Kim/async,evdevgit/async,haggholm/async,renruixi/async,lonely8rain/async,SaiNadh001/async,FrankSunnyvale/async,steverobb/async,hargasinski/async,evdevgit/async,ecasilla/async,wrenth04/async,LeoYao/async,pandoraui/async,zhhb/async,Connectlegendary/async,KnottedRain/async,Segeon-Kim/async,rlugojr/async,jaruba/async,ibakaidov/async,caolan/async,megawac/async,RickyDan/async,youprofit/async,imjerrybao/async,DaAwesomeP/async,KnottedRain/async,beni55/async,bjlxj2008/async,mcanthony/async,Kikobeats/async,xiebaochun/async,abhishekgahlot/async,beni55/async,llwanghong/async,garysye/async,FrankSunnyvale/async,jamesjnadeau/async,llwanghong/async,hargasinski/async,RickyDan/async,JulianVolodia/async,DanieleTassone/async,markyen/async,gypsydave5/async,navyxie/async,ecasilla/async,kolomiichenko/async,bjlxj2008/async,arigo-software/async,youprofit/async,scq000/async,moander/async,mcanthony/async,DDunc/async,Connectlegendary/async,navyxie/async,modulexcite/async,JulianVolodia/async,Zhang/async,jamesjnadeau/async,haggholm/async,SaiNadh001/async,Qix-/async,jnordberg/async,jnordberg/async,steverobb/async,carck/async,scq000/async,r14r-work/fork_javascript_async,moander/async,suguru03/async,andalm/async,zhakui/async,chaddm/async,Segeon-Kim/async,xiebaochun/async,gypsydave5/async,XM-Right/async,megawac/async,pandoraui/async,suguru03/async,Qix-/async,wrenth04/async,imjerrybao/async,andalm/async,DDunc/async,r14r/fork_javascript_async,caolan/async