Added ability to generate an EmailBuilder object from a Class object

lib/Emailer.js

@@ -204,6 +204,15 @@ class EmailBuilder {
 
 		return message;
 	}
+
+	static generateFromClass(c) {
+		const emailBuilder = new EmailBuilder();
+
+		emailBuilder.addTo([ ...c.students, ...c.teachers ]
+			.map(u => u.getEmail()));
+
+		return emailBuilder;
+	}
 }
 
 /**