Add support for HTTP basic access authentication.
Add support for HTTP basic access authentication.

With Webdis it is possible to define some access control rules to allow or
disallow certain commands and one of the possible configurations is based on
plain old HTTP authentication.

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