add entity in editor
select entities
delete connection
selectedEntity holds the obj, entities deletable
keypress binding (d for delete)
simple rest api - no db
simple resource fetch and post in angular
delete entity on delete key
added mongo, restructured routes, extracted api
get by id
delete document
put
fixed push error
fix imports
entity api
load entities from api in editor
delete only with D button
persist entity position
edge changes are saved
Merge branch 'feature/doc_persist' into develop