Add wrapper for Postmark client

Author: rossta

app/clients/postmark_client.rb

@@ -0,0 +1,13 @@
+class PostmarkClient
+  def self.deliver_messages(messages)
+    new.deliver_messages(messages)
+  end
+
+  def deliver_messages(messages)
+    api_client.deliver_messages(messages)
+  end
+
+  def api_client
+    @api_client ||= Postmark::ApiClient.new(Rails.configuration.settings.postmark_api_token)
+  end
+end