Add support for configurable HTTP request factory for proxy clients#646

dbu merged 4 commits intoFriendsOfSymfony:2.xFriendsOfSymfony/FOSHttpCacheBundle:2.xfrom

jdreesen:feat/configure-proxy-client-request-factoryjdreesen/FOSHttpCacheBundle:feat/configure-proxy-client-request-factoryCopy head branch name to clipboard