Fixing incorrectly shown nodes on browse/* maps

Previously, tagged nodes of ways were shown on browse/way and browse/relation pages.

Now, nodes are not shown on browse/way pages and only nodes which are direct members of the relation are shown on browse/relation pages.

This depends on a some [improvements](https://github.com/jfirebaugh/leaflet-osm/pull/1) of the leaflet-osm plugin.

Use the following relation as a test-bench: http://master.apis.dev.openstreetmap.org/browse/relation/4294968148

this is wrong:
![wrong](https://f.cloud.github.com/assets/1927298/500911/9d0fa47e-bc85-11e2-96af-ec12aafa5ea3.png)
this is correct: 
![right](https://f.cloud.github.com/assets/1927298/500915/c6439242-bc85-11e2-8c23-bac9f56a721d.png)