Fix errors bug - for functions return message and name object

lib/errors.js

@@ -1,4 +1,4 @@
-const Errors = {
+let Errors = {
 	unknown: 'An unknown error occured on our end. Please try again later',
 	accountAlreadyCreated: 'This account has already been created',
 	missingParameter (param) {
@@ -15,14 +15,31 @@ const Errors = {
 	}
 }
 
-for(var errorName in Errors) {
-	var temp = {}
-	temp.name = errorName
-	temp.message = Errors[errorName]
+let ProcessedErrors = {}
+function processErrors(errorName) {
+	let temp
+
+	if(typeof Errors[errorName] === 'function') {
+		temp = function() {
+			let message = Errors[errorName](...arguments)
+			return {
+				name: errorName,
+				message: message
+			}
+		}
+	} else {
+		temp = {}
+		temp.name = errorName
+		temp.message = Errors[errorName]
+	}
 
-	Errors[errorName] = temp
+	return temp
+}
+
+for(var errorName in Errors) {
+	ProcessedErrors[errorName] = processErrors(errorName)
 }
 
-Errors.VALIDATION_ERROR = 'VALIDATION_ERROR';
+ProcessedErrors.VALIDATION_ERROR = 'VALIDATION_ERROR';
 
-module.exports = Errors
+module.exports = ProcessedErrors