proposal of shorter osm attribution

based on http://wiki.openstreetmap.org/wiki/Legal_FAQ#3._Using
make CI build faster
missing quote fix
Merge pull request #107 from maxdeepfield/patch-1

missing quote fix
Merge pull request #106 from PeterDaveHello/patch-1

make CI build faster
Merge pull request #104 from leaflet-extras/osm_attr

proposal of shorter osm attribution
Merge branch 'master' of github.com:leaflet-extras/leaflet-providers into remove-control

Conflicts:
	index.html