PERF: Don't query solr again if we know there will be no results
Merge pull request #645 from projecthydra/remove_duplicate_solr_query

PERF: Don't query solr again if we know there will be no results
Bump ldp dependency to 0.2
Merge pull request #646 from projecthydra/update_ldp

Bump ldp dependency to 0.2
Bump version to 9.0.0.beta7
fixes #648 Bug: LoadableFromJson raises error when you have extra fields in the object profile (from calling .as_json)