test
added centroid calculation to cluster aggregation
test
using GeoManager. Added bbox filter for clusters
modified get_models to return specified model only
added pincode aggregation script
fixed a bug with base models
fixed bbox filter for school
removed hardcoded table name
removed common functions to base class
using get_models to get the base models
Merge branch 'bibhas' into dev
added centroid calculation script
Merge branch 'bibhas' into dev
added block and district search with bbox. concerns #8
added Pincode model and endpoint. Concerns #9
Added block, district, pincode models and endpoints