phase4 2.5.1

• Added a parameter to enforce the packaging in MIME messages, even if no attachment is present. See #186 - thanks @problemzebra2
• Fixed an error that if no payload is present no encryption will be performed

Full Changelog: phase4-parent-pom-2.5.0...phase4-parent-pom-2.5.1

Dependencies required:

• ph-bc/ph-collection/ph-commons/ph-dao/ph-datetime/ph-jaxb/ph-json/ph-scopes/ph-security/ph-settings/ph-xml 11.1.2
• ph-xsds-xmldsig 3.0.0
• ph-http/ph-httpclient/ph-mail/ph-network/ph-servlet/ph-useragent/ph-web 10.1.5
• ph-oton-io/ph-oton-audit/ph-oton-security 9.2.1
• ph-masterdata/ph-tenancy 7.0.1
• peppol-commons/peppol-id/peppol-sbdh/peppol-smp-client 9.0.8
• phive-engine 9.0.0
• phive-rules-peppol 3.1.2
• angus-mail 2.0.2
• angus-activation 2.0.1
• httpclient 5.2.1
• BouncyCastle 1.76
• WSS4J 3.0.1
• XMLSec 3.0.3
• Servlet API 5.0.x
• JAXB 4.0.x
• SLF4J 2.0.x