Merge branch 'master' into master

Author: MJMortimer

Xero.Api/Infrastructure/Exceptions/NotAvailableException.cs

@@ -4,7 +4,7 @@
 namespace Xero.Api.Infrastructure.Exceptions
 {
     [Serializable]
-    internal class NotAvailableException
+    public class NotAvailableException
         : XeroApiException
     {
         public NotAvailableException() { }

Xero.Api/Payroll/Australia/Model/Types/EarningsType.cs

@@ -14,6 +14,8 @@ public enum EarningsType
         [EnumMember(Value = "ALLOWANCE")]
         Allowance,
         [EnumMember(Value = "LUMPSUMD")]
-        LumpSumD
+        LumpSumD,
+        [EnumMember(Value = "EMPLOYMENTTERMINATIONPAYMENT")]
+        EmploymentTerminationPayment
     }
-}
+}