Updated XEP-0092 to take callbacks and return the version result stanza.
Allow for simplified XPath namespaces
Update tests for XEP-0092
Remove unused portions of XMLMask
Add BoB data to message and presence stanzas.
Updated XEP-0199 to take and return standardized values.

Handles Iq errors appropriately when the recipient can't be found.
Remove old versions of some plugins.
Modernize the Gmail plugin.
Add Google Settings plugin.
Simplify Gmail notifications.
Fix issues in Google settings plugin.
Add plugin for Google's nosave feature.
Merge branch 'master' into develop
Cleanup and expand XEP-0065 plugin.
Update tostring to inject xmlns definitions when needed.
Fixes for vCard avatar hash calculations and MUC considerations.
Ensure XMPPError.text is a string.
Put StringPrep exception handler with the right try block.
Add Google JID Domain Discovery plugin
Refactor Google GTalk extensions into a single meta plugin.