[leaflet] upgrade to 0.7.1
remove bower's leaflet since it does not contain dist files
fix leaflet image path
fix build order (and error msg on first build)
remove old js files
disable access point plugin in config.json.example
get title from configModel
replaced hardcoded api_url with config value
add routerLastUpdate filter

fixes #4.
remove Freifunk from title in example config

This was just for debugging purposes. "Freifunk Berlin" is replaced by
"global".

Affects libremap/libremap.net/issues/1.
fix bug where links are not shown/updated