update repository .gitignore
implement add_data(), get_data()
test get_data()
bugfix
get_value
get_value()
readability improvements
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
Add couchdb views to models
create views before testing
check if graph and subject passed to get_data match the doc