#231 Galago: ProxyRetrieval getDocuments doesn't work

[John Foley]

This is because the reflection in StreamContextHandler is brittle; it tries to find a method with the signature (ArrayList, DocumentComponents) instead of (List, DocumentComponents)...

There are some commented out lines in ProxyRetrievalTest that crash if uncommented.

This test could use to check more things.

[David Fisher]

Test for assignable subtypes, rather than exact type match: http://stackoverflow.com/questions/2169497/unexpected-class-getmethod-behaviour

To ship in 06/2014 release.