Fix a tag, undefined url + feature

[Coosos]

I recreated this MR because, I moved the code to a new branch

Fix :

• Fix close 'a' tag
• Fix: undefined url icon in store view
• Fix: Store list sorted by distance

Clean :

• Use initMarkers from map-mixin instead of store-map component

Feature :

• Add generateMarker function (Allows to easily customize it with a mixin)
• Move marker icon html string to own function (Allows to easily customize it with a mixin)