fixes #393: detect Image map in hint mode
fixes #393: detect Image map in hint mode

PrestanceDesign/vimium,VPashkov/vimium,Lw-Cui/vimium,wildeyes/vimium,dimatter/vimium,justalittlenoob/vimium,mrmr1993/vimium,Aleroniponi/vimium,douglas-larocca/vimium,bkudria/vimium,zhangmin510/vimium,elegantwww/vimium,gdh1995/vimium,willsALMANJ/vimium,PickRelated/vimium,decaffeinate-examples/vimium,dimatter/vimium,Robinson10240/vimium,gdh1995/vimium,PickRelated/vimium,Aleroniponi/vimium,csmalin/vimium,gdh1995/vimium,willsALMANJ/vimium,zhangmin510/vimium,justalittlenoob/vimium,philc/vimium,willsALMANJ/vimium,douglas-larocca/vimium,elegantwww/vimium,wildeyes/vimium,zhangmin510/vimium,philc/vimium,csmalin/vimium,hhsue/vimium,decaffeinate-examples/vimium,wildeyes/vimium,PrestanceDesign/vimium,tuchangwei/vimium,elegantwww/vimium,tuchangwei/vimium,llimllib/vimium,jb55/vimium-plus,bkudria/vimium,Lw-Cui/vimium,csmalin/vimium,borgified/vimium,dimatter/vimium,bkudria/vimium,elderbas/vimium,cyrixhero/vimium,Aleroniponi/vimium,borgified/vimium,philc/vimium,mrmr1993/vimium,PrestanceDesign/vimium,smblott-github/vimium-smblott,shaung/vimium,smblott-github/vimium,crazypenguincode/vimium,elderbas/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,VPashkov/vimium,jb55/vimium-plus,VPashkov/vimium,PickRelated/vimium,Robinson10240/vimium,justalittlenoob/vimium,poacher2k/vimium,tuchangwei/vimium,smblott-github/vimium-smblott,hhsue/vimium,Robinson10240/vimium,smblott-github/vimium,hhsue/vimium,douglas-larocca/vimium,cyrixhero/vimium,crazypenguincode/vimium,poacher2k/vimium,Lw-Cui/vimium,poacher2k/vimium,elderbas/vimium,smblott-github/vimium,borgified/vimium,cyrixhero/vimium