add return button
add base "compute and navigate page"
add computePath function in compute Engine exemple
remove "add node without connection"
improve UI manageMap
correct typo error
add accessors Destination
correct geohash

 * swap latitude and longitude in encode argument
add base dijkstra
reduce precision of geohash (more reliable)
replace string const by predeclared conts
correct typo
improve display of importing map
swap longitude and latitude in distanation formular
add rule for create tours'map
add creation of graph usable for compute path
improve display and add felocation go page
add promise.js for old browser
add default destination
search nearest node on graph work well