[#655] Update AHC to 1.7.6
[#655] Update AHC to 1.7.6

aradchykov/playframework,ktoso/playframework,aradchykov/playframework,zaneli/playframework,zaneli/playframework,richdougherty/playframework,playframework/playframework,wegtam/playframework,Shenker93/playframework,Shruti9520/playframework,benmccann/playframework,playframework/playframework,wsargent/playframework,Shenker93/playframework,rajeshpg/playframework,mkurz/playframework,marcospereira/playframework,mkurz/playframework,hagl/playframework,wegtam/playframework,wsargent/playframework,mkurz/playframework,rajeshpg/playframework,ktoso/playframework,wegtam/playframework,Shenker93/playframework,Shruti9520/playframework,richdougherty/playframework,rajeshpg/playframework,Shenker93/playframework,wsargent/playframework,zaneli/playframework,marcospereira/playframework,Shruti9520/playframework,zaneli/playframework,marcospereira/playframework,benmccann/playframework,wegtam/playframework,playframework/playframework,hagl/playframework,marcospereira/playframework,ktoso/playframework,wsargent/playframework,aradchykov/playframework,rajeshpg/playframework,benmccann/playframework,benmccann/playframework,ktoso/playframework,richdougherty/playframework,hagl/playframework,mkurz/playframework,Shruti9520/playframework,aradchykov/playframework,richdougherty/playframework,hagl/playframework