cubicweb-leaflet #4725752 Don't hardcode L.Icon.Default.imagePath [validation pending]

It is currently set to http://cdn.leafletjs.com/leaflet-0.4.5/images with an harcoded 0.4.5 version number of leaflet whereas the version shipped with the cube is 0.5.1.

This can cause errors because leaflet changed marker icon urls across versions, especially for 2x versions of markers.

Version numbers should be kept synced by using L.version.

prioritynormal
typebug
done in0.4.0
load0.100
load left0.000
closed by#08a33b22da5a [js] use L.version to build cdn url rather than harcoding version number (closes #4725752)
patch[js] use L.version to build cdn url rather than harcoding version number (closes #4725752) [applied][js] use L.version to build cdn url rather than harcoding version number (closes #4725752) [applied]