Downgraded postgis version to 1.5.3 :(
Revert "Downgraded postgis version to 1.5.3 :("

This reverts commit 98c0e151591b6607a7c6cfdc6355a8316ba9009d.
Updated to postgis 2.0.3 and included json-c fix
Whoops
PostGIS requires PostgreSQL to be installed first
Don't brew depend_on postgresl - Will always pull down latest version, use require package instead
Update PostGIS to 2.1.0.