Member profile

Improved design/layout of member profile page and added an OSM/mapbox map.  It's not perfect but I think it's a considerable improvement.

A point of interest: I created content areas "subtitle" and "buttonbar" which you can use like this:

    - content_for :title, "A page"
    - content_for :subtitle, "With a subtitle"
    - content_for :buttonbar do
      = link_to "Do this", link, :class => 'btn btn-default'
      = link_to "Do that", link, :class => 'btn btn-default'

The idea of this is to standardise the layout of the top section of the page.  I also moved the crop detail page over to using this system, hence a bunch of crop stuff in this PR.
Yep, PR #102 says we made this change for privacy reasons but might revisit that decision in future. I guess it is now the future :-)