remove dependency on old YAML parser syck
update libertree-model
replace "pony" with latest "mail" and update all gems
use "mail" directly instead of "pony"
Merge pull request #9 from Libertree/mail

Use "mail" directly instead of through "pony"
optionally use GPG for encrypted email
include rejection reason message in retry error
distinguish between local and remote message recipients
forward DM via email if requested
include sender name when forwarding DM
Merge pull request #10 from Libertree/mail-gpg

optionally use GPG for encrypted email
use public key for email
ignore vendor/ and .bundle/ directories
Merge branch 'master' into xmpp

Conflicts:
	Gemfile
	Gemfile.lock
	lib/jobs.rb
	lib/libertree/server/responder/message.rb
	spec/jobs_spec.rb