#10: update leaflet

#9 update leaflet

Add additional update server

Update README.md

version 2.6.0

Set 2.6.0 beta 2 version

add update server, to version 2.6.0b1

update leaflet 1.1.0, add unpkg.com cdn, to version 2.5.0

update leaflet 1.0.3, to version 2.4.0

Update to Leafletjs 1.0.1