Fix mock headers to spec.
Fix mock headers to spec.

Headers should end in CRLF make them so.

siwinski/httpful,barracudanetworks/httpful,mojaray2k/httpful,proneoas/httpful,myorb/httpful,nategood/httpful,cybercircuits/httpful,infame-io/httpful,quafzi/httpful,claimsmall/httpful