Optimize parseHeaderNoAttr (code from Matt)
Optimize parseHeaderNoAttr (code from Matt)

jberryman/wai,coypoop/wai,sordina/wai,mfine/wai,kazu-yamamoto/wai,rgrinberg/wai,ygale/wai,creichert/wai,soenkehahn/wai,urbanslug/wai,tolysz/wai,awpr/wai,erikd/wai,coypoop/wai,rgrinberg/wai,sol/wai,tolysz/wai,tolysz/wai,ygale/wai,erikd/wai,dylex/wai,sol/wai,iquiw/wai,coypoop/wai,erikd/wai,sol/wai,iquiw/wai,creichert/wai,AndrewRademacher/wai,rgrinberg/wai,sordina/wai,urbanslug/wai,coypoop/wai,jberryman/wai,frontrowed/wai,awpr/wai,dylex/wai,utdemir/wai,beni55/wai,dylex/wai,iquiw/wai,tolysz/wai,sordina/wai,soenkehahn/wai,dylex/wai,rgrinberg/wai,utdemir/wai,frontrowed/wai,AndrewRademacher/wai,mfine/wai,iquiw/wai,frontrowed/wai,soenkehahn/wai,urbanslug/wai,ygale/wai,frontrowed/wai,sordina/wai,kazu-yamamoto/wai,erikd/wai,beni55/wai,AndrewRademacher/wai,ygale/wai,awpr/wai,soenkehahn/wai,jberryman/wai,AndrewRademacher/wai,mfine/wai,yesodweb/wai,jberryman/wai,utdemir/wai,urbanslug/wai,rgrinberg/wai,awpr/wai,yesodweb/wai,mfine/wai,utdemir/wai,beni55/wai,beni55/wai