Merge pull request #336 from xrmx/debian-fixes

A couple of patches from debian packaging
first attempt of Tiger support
second attempt of Tiger support
better computation of listen queue load
better thunder_lock usage on unbit
removed typo on osx
support for rb_reserved_fd_p
added setdocroot
added sendfile routing action
use the right sendfile abstraction
added fastfile routing action
added prototype servlet plugin