Added ruby21 to avl_tree

Package-Manager: portage-2.2.8-r1
Added ruby21 to dev-ruby/clamp

Package-Manager: portage-2.2.8-r1
New ebuild for dev-ruby/rantly

Package-Manager: portage-2.2.8-r1
Added old version of parslet for edn-ruby

Package-Manager: portage-2.2.8-r1
Execute tests for edn

Package-Manager: portage-2.2.8-r1
Moved edn-ruby to edn to match gem name

Package-Manager: portage-2.2.8-r1
Updated dependencies
Moved murmurhash3-ruby to murmurhash3 to match gem name
Updated murmurhash3: Build for ruby21 too, dropped jruby, removed test restriction

Package-Manager: portage-2.2.8-r1
Added .gitignore
Added .travis.yml for Continous Integration using travis-ci.org