AJP13 protocol parser

Tobias Begalke e4f4b07019 - added some bounds checks since munchclient crashed in production %!s(int64=7) %!d(string=hai) anos
ajp13.go e4f4b07019 - added some bounds checks since munchclient crashed in production %!s(int64=7) %!d(string=hai) anos
ajp13_test.go c0560ceda7 init %!s(int64=7) %!d(string=hai) anos
header.go c0560ceda7 init %!s(int64=7) %!d(string=hai) anos
method.go c0560ceda7 init %!s(int64=7) %!d(string=hai) anos