Fix overlapping text in markdown help
Keep the map visible as the changeset page is scrolled
Force notes list to be realised in notes#mine

There is a rails bug which means that using count on a relation
that uses uniq and offset/limit and which hasn't been realised
yet will always return one, so force it to be realised.
Merge branch 'master' of git://github.com/openstreetmap/openstreetmap-website