Make the bundle constructor silently remove null values from the given data
Prevent null pointer errors by casting instead of using toString
In tolerant mode, don't trash the whole file is one RDF skos item
fails validation.
Change direction of relatesTo relation, and fetch it automatcially.
Merge pull request #2 from lindareijnhoudt/master

annotations and mirrored URs
Merge Linda's EAC import changes.
Fix WIP linking functions
Update Guava version in replacejars script
Fix position of maxdepth arg to avoid warning
Update Guava again (grrrr...)
Add some setup docs
Tweak formatting
Create a new 'Link' entity to handle linking entities in complex ways.

This functionality was previously handled by the Annotation entity, but
that was becoming much too complicated.
Remove some now-unneeded fetching
Normalise the UndeterminedRelationship value/description/etc property
so that it is always just 'name'.
Try and enforce the existence of a relationship type (place, person, creator etc).
Fix fixtures
Add subject to event context
Rename Property model to UnknownProperty
Automatically fetch unknown properties with descriptions