terminology note
terminology note
get_values returns an empty list if no values were found
remove requests dependency
include subject, graph in model.get_data

This is necessary for future document modules that may store more than
one entity in a single couchdb doc.
Merge branch 'feature/doc-agnostic-ers' into develop
conflict resolution
add get_data to the LocalModelBase
introduce ERSReadOnly
Merge branch 'feature/remotes' into develop