Merge pull request #1 from galaxie/master

Allowed epgsql_utils_conn_pool to be used with supervisor not only supervisor2
Sql: construct queries properly when condition involves nulls
Merge pull request #2 from galaxie/master

Added basic model parse_transform
Merge pull request #3 from keynslug/master

Sql: construct queries properly when condition involves nulls
Added missed model type declarations
Merge branch 'master' of github.com:platbox/epgsql_utils
Changed hardcoded pool name to custom ones