core: Fix in Zotonic after removing access to the webmachine_request:send_response/2 function
Merge pull request #613 from yoonka/fix-crash-in-perf-logs

core: Fix in Zotonic after removing access to the webmachine_request:send_response/2 function

Needed due to merging pr zotonic/webzmachine#12: https://github.com/zotonic/webzmachine/pull/12