Added ebuild for stud (dep of logstash)

Package-Manager: portage-2.2.8-r1
Added ebuild for stud (dep of logstash)

Package-Manager: portage-2.2.8-r1
Added ffi-rzmq-core

Package-Manager: portage-2.2.8-r1
Added ffi-rzmq

Package-Manager: portage-2.2.8-r1
New ebuild for ruby-cabin

Package-Manager: portage-2.2.8-r1
New ebuild for gelf

Package-Manager: portage-2.2.8-r1
New ebuild for gelfd

Package-Manager: portage-2.2.8-r1
Rough ebuild for logstash. DO NOT USE IT!

It's still lacking some dependencies and might not work as expected