move EntityCache, import_nt, import_nt_rdflib to utils.py
update tests
test import_nt & import_nt_rdflib
delete db after testing
remove create_ers()
remove ERSReadWrite class
Quick fix to emulate deleted ERSReadWrite class
Merge branch 'develop' of https://github.com/ers-devs/ers into feature/cleanup
move get_peers() to ERSReadOnly class
move get_annotation() to ERSReadOnly class
move search() to ERSReadOnly class
move get_values() to ERSReadOnly class
move ERSPeerInfo class to daemon.py
move merge_annotations() into ERSReadOnly class
move constants from ers.py to utils.py
Merge branch 'develop' of https://github.com/ers-devs/ers into feature/cleanup
Merge branch 'feature/cleanup' into develop