Shibboleth Developer's Meeting, September 6, 2013

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• New plugin abstractions for MetadataResolver itself
• MetadataFilter impl which does 1 treewalk and takes plugins similar to #1
• Just implement each as a MetadataFilter unto itself, so each does own treewalk.  Advantage is no new abstractions.

Refactored MetadataCredentialResolver to use new credential caching mechanism based on XMLObject#getObjectMetadata class-to-instance multimap.

Refactored HTTP metadata resolvers to use Apache HttpClient v4.  Some TODO's remaining around capabilities differences to v3 client.

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