cleaning
update model
	new file:   data_model/data/exp8.js
	modified:   data_model/change_model.js
	modified:   data_model/populate_db.js
cleanning
cleanning
update model
enhance data model
refactoring
refactoring directive names
new librairies
saving map, toggle nodes, still buggy
Update README.md
clean map before saving to db
save map
deactivate node toggle
refactoring
cleanning map before saving to db
saving map to db
change map name
connection to local db
add .gitignore
add files