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CDB-1589 #fixes Fixes d3stats for organizations
Increase the geocoder waiting interval to 15 minutes
Added delete method in geocoding class
CDB-1558 Use Nokia non-batch geocoder with small tables

Nokia regular geocoding api seems to be faster and more reliable
with small tables (~250 rows).

This commit modifies the Geocoder component to use that API when the
amount of requested rows is smaller than a given limit.
CDB-1558 Raise the limit of the batch geocoder
CDB-1521 WIP Improve embed map speed

* Cache embed maps on varnish
* Fix related specs and add them to Makefile