[okfn-labs] More improvements to Recline Data Explorer: Filters, Maps and Field customization!

[Rufus Pollock]

Lots more new features and improvements in Recline:

http://okfnlabs.org/recline/app/

## Filters: https://github.com/okfn/recline/issues/66

Filters can now be added at any time from column menu, and can be
edited and removed

To see it in action choose a facet item from the facet menu and apply it

## Map view: http://okfnlabs.org/recline/app/#map

we now have a map view (hit the map button in the demo!) thanks to
Adria Mercader

## Fields: https://github.com/okfn/recline/issues/68

Fields can have custom renderers and derivers (which allow the field
value to be computed from other values in that document)

No demo yet, but see:

http://okfnlabs.org/recline/docs/model.html#field

## Improved docs

Lots more documentation of model and in main documentation page. Also
more examples coming soon.

Rufus