remove unused plpythonu and cartodb dependencies

Fixes #161

src/pg/test/expected/01_install_test.out

@@ -1,6 +1,4 @@
 -- Install dependencies
 CREATE EXTENSION postgis;
-CREATE EXTENSION plpythonu;
-CREATE EXTENSION cartodb;
 -- Install the extension
 CREATE EXTENSION observatory VERSION 'dev';

src/pg/test/sql/01_install_test.sql

@@ -1,7 +1,5 @@
 -- Install dependencies
 CREATE EXTENSION postgis;
-CREATE EXTENSION plpythonu;
-CREATE EXTENSION cartodb;
 
 -- Install the extension
 CREATE EXTENSION observatory VERSION 'dev';

src/pg/test/sql/44_observatory_geometries_test.sql

@@ -34,7 +34,7 @@ SELECT cdb_observatory.OBS_GetBoundary(
 -- expect null geometry since there are no census tracts at null island
 -- timespan implictly null
 SELECT cdb_observatory.OBS_GetBoundary(
-  CDB_LatLng(0, 0),
+  ST_SetSRID(ST_MakePoint(0, 0), 4326),
   'us.census.tiger.census_tract'
 ) IS NULL As OBS_GetBoundary_null_island_census_tract;
 
@@ -78,7 +78,7 @@ SELECT cdb_observatory.OBS_GetBoundaryId(
 
 -- should give back null since there is not a census tract at null island
 SELECT cdb_observatory.OBS_GetBoundaryId(
-  CDB_LatLng(0, 0),
+  ST_SetSRID(ST_MakePoint(0, 0), 4326),
   'us.census.tiger.census_tract'
 ) IS NULL As OBS_GetBoundaryId_null_island;