adds test and migrations for regional stats
adds regional stats calculator
adds global stats module and test
Adds delete all regional and global stats feature
Removes migration that deletes percentage_pa_cover
Adds regions to statistics rake task
do not generate visualization if no stats
regional stats
remove annular viz with no data and centre remaining vizs
Merge branch 'viz-stats' into regional_stats

* viz-stats:
  Remove now-replaced country geometry populator
  Move country geometry population in to separate classes
  Refactors marine geometry splitting in to country geometry populator
  Geometry dissolver buffers point geometries inline
  Refactors country dissolving logic in to aptly named module
  Move mollweide projection in to migrations
  Move country geometry indexes to migrations
  final list of country exceptions for the split_country_marine query
  Remove unnecessary logging from PA dissolving
  geospatial queries work on dissolve_country and split_country_marine
  Removes unnecessary white space
  Remove unnecessary logging from countries geom importer
  fixes rake task typo
  Refactors Countries Geometries Importer
  Compacts migrations to reduce number required to db setup
  split_country_marine query - fix geoms before intersection
  removed a todo comment
  added condition to dissolve_country query and fixed tests
  Added marine_eez_pas_geom and marine_ts_pas_geom to countries table and added queries to geometry module

Conflicts:
	app/controllers/stats/country_controller.rb
	db/structure.sql
	test/integration/stats/country_test.rb
Remove geometry test for replaced country geometry populator
added pas as global area stat for countries
test for percentage_global_pas_area and fixed existing tests
Refactors geospatial calculations

Move queries in to templates, and clean up rake task to have less
responsibility.
Calculator records timestamp for calculations
Adds morocco to list of complicated geoms
percentage_global_pas_area for regions and tests
Adds eez and ts to statistics calculation
Merge branch 'regional_stats' of github.com:unepwcmc/ProtectedPlanet into regional_stats

* 'regional_stats' of github.com:unepwcmc/ProtectedPlanet:
  percentage_global_pas_area for regions and tests
  test for percentage_global_pas_area and fixed existing tests
  added pas as global area stat for countries

Conflicts:
	test/integration/stats/country_test.rb
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