Added rake task to start server in a more production-ready manner using Puma; move config values to config directory

Rakefile

@@ -15,7 +15,11 @@ namespace :db do
 end
 
 namespace :server do
-  task :dev do
+  task :start do
+    system("bundle exec puma -C config/puma.rb")
+  end
+
+  task :reload do
     %x{guard}
   end
 end