OF-179: Add group features for MUC administration

Introduces MUC group affiliation feature; allow users to join rooms
based
on group membership; distribute presence updates for MUC affiliation
changes due to group membership events.
OF-324 Offline Email Notification Plugin

unsupported plugin provided by Nicholas Mossie
Merge pull request #100 from tevans/OF-179-PR

OF-179: Add group features for MUC administration
OF-179: Publish presence updates for group changes

Distribute updated presence packets after changing MUC room affiliations
due to group membership changes
Merge pull request #106 from tevans/OF-179-PR

OF-179: Publish presence updates for group changes
OF-179: Minor text changes for UI console

Incorporating community feedback
OF-179: Additional UI text changes

Use consistent labels for menu and page header
Merge pull request #107 from tevans/OF-179-PR

OF-179: Minor text changes for UI console
	Resolve exception
		org.jivesoftware.util.CertificateManager - Error decoding subjectAltName
		java.lang.ClassCastException: org.bouncycastle.asn1.DERTaggedObject
		cannot be cast to org.bouncycastle.asn1.ASN1Sequence
Merge pull request #108 from wmz7year/fixCertificateManager

Update CertificateManager.java
Merge pull request #103 from akrherz/of324

OF-324 Offline Email Notification Plugin