Export service name (#40)

* Fix for having multiple links

* Fix array insertion

* Insert was invalid, push instead:

* Add test

* Various refactoring & fixes around passing in arrays to taskdef parameters

* Add export for servicename

* Move output to end of file

ecs-service.cfndsl.rb

@@ -1,5 +1,7 @@
 CloudFormation do
 
+  export = defined?(export_name) ? export_name : component_name
+
   awsvpc_enabled = false
   if defined?(network_mode) && network_mode == 'awsvpc'
     awsvpc_enabled = true
@@ -555,4 +557,9 @@
 
   end
 
+  Output("ServiceName") {
+    Value(FnGetAtt(:Service, :Name))
+    Export FnSub("${EnvironmentName}-#{export}-ServiceName")
+  }
+
 end