Cannot serialise custom objects defined in plugins using Bandana

Bandana does not currently search the plugin classloader when serialising.

An error similar to this results if a plugin author tries to save custom objects using bandana:

[ConfluenceBandanaPersister] Error loading stream for context :
[com.atlassian.confluence.setup.bandana.ConfluenceBandanaContext@13fe9,
spaceKey='SBX']
com.thoughtworks.xstream.converters.ConversionException:
com.host.com.TestObject :
com.host.com.TestObject
---- Debugging information ----
required-type : java.util.HashMap
cause-message : com.host.com.TestObject :
com.host.com.TestObject
class :
com.atlassian.confluence.setup.bandana.ConfluenceBandanaConfigMap
message : com.host.com.TestObject :
com.host.com.TestObject
line number : 17
path :
/confluence-config-map/values/entry[2]/com.host.com.TestObject
cause-exception :
com.thoughtworks.xstream.alias.CannotResolveClassException
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