Added back the old launchd.plist for use with agents 0.2
Added back the old launchd.plist for use with agents 0.2

Jasperswaagman/agent,buildkite/agent,grosskur/agent,Shopify/agent,buildkite/agent,Jasperswaagman/agent,joelmoss/agent,es/agent,grosskur/agent,Shopify/agent,Jasperswaagman/agent,joelmoss/agent,grosskur/agent,es/agent,Shopify/agent,buildkite/agent,es/agent,joelmoss/agent