Added testing env check

ref #154

src/mailer.ts

@@ -9,6 +9,7 @@ import { MailSendingError } from './errors/MailErrors';
 export class Mailer {
     public static base: string = config.mailer_url;
     public static key: string = config.mailer_key;
+    public static testing: boolean = config.testing;
 
     /**
      * Function for sending a password reset mail.