update eventmachine

The main reason for the upgrade is that eventmachine 0.12.10 does not
compile on Debian without a patch.
Remove unnecessary version restriction on eventmachine gem.
update libertree-model
use old-fashioned hash syntax for ruby 1.9.x
generate private key with openssl genrsa
host and password fields are optional
Merge branch 'master' into xmpp

Conflicts:
	Gemfile.lock