Add support for variable arguments in Predis\Client::pipeline().
Add support for variable arguments in Predis\Client::pipeline().

johnhelmuth/predis,protomouse/predis,quangnguyen90/predis,CloudSide/predis,SwelenFrance/predis,dzung2t/predis,stokes3452/predis,nguyenthaihan/predis,nrk/predis,mrkeng/predis,channelgrabber/predis,dominics/predis,zhangyancoder/predis,SecureCloud-biz/predis,gopalindians/predis,WalterShe/predis,RedisLabs/predis,RudyJessop/predis,vend/predis,gencer/predis,oswaldderiemaecker/predis,lvbaosong/predis,moria/predis