First import from https://prosody-modules.googlecode.com/hg/mod_s2soutinjection/mod_s2soutinjection.lua

original commit:
4057f176be7b by Kim Alvefur <z...@zash.se> on Jun 27, 2013
mod_s2soutinjection: Initial commit,
variant of mod_srvinjection using 0.9+
APIs