Replace lib/sql by the cartodb-postgresql submodule
Update cartodb-postgresql submodule
Fix quota enforcement on migration to cartodb-postgresql submodule

See https://github.com/CartoDB/cartodb/pull/441#issuecomment-42648865
Update cartodb-postgresql submodule reference

 - Do not force creation of new roles (cdb_org_admin, cdb_org_user)
 - Forbid calling CDB_CartodbfyTable unless user quota is set
 - Check quota against value set by CDB_SetUserQuotaInBytes()
Merge pull request #441 from CartoDB/cartodb_extension

Merging to master after some staging testing