add tags xades-epes

[FuriosoJack]

There is a way to use the xades-epes which has the following labels.

It would also be important to be able to specify the node where the signature will be inserted

<ns8:SigningTime>2017-12-04T08:36:36.103-05:00</ns8:SigningTime>

<ns8:SignaturePolicyIdentifier><ns8:SignaturePolicyId><ns8:SigPolicyId><ns8:Identifier Qualifier="OIDAsURI">http://www.dian.gov.co/contratos/facturaelectronica/politicafirma_v1_0.pdf</ns8:Identifier><ns8:Description>Política de firma para facturas electrónicas de la República de Colombia</ns8:Description></ns8:SigPolicyId><ns8:SigPolicyHash><ns6:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><ns6:DigestValue>K0r0jWxQvJdcB4Q5R00f/FgQIrQ=</ns6:DigestValue></ns8:SigPolicyHash></ns8:SignaturePolicyId></ns8:SignaturePolicyIdentifier>

<ns8:SignerRole><ns8:ClaimedRoles><ns8:ClaimedRole>supplier</ns8:ClaimedRole></ns8:ClaimedRoles></ns8:SignerRole>