first stable release of connector_flow

Some time ago we at initOS announced that we worked on a framework on top of the connector to implement import/export tasks. Since then the code has matured and has proven useful in customer projects, so we want to share the result.

connector_flow is inspired by existing file_exchange and connector_file addons, but aims to be as lightweight and flexible as possible. The idea is to have independent tasks that are organized in a flow similar to workflows. Along with the module we provide two simple examples that use connector_flow for exporting partners as CSV via FTP and for importing product data from CSV, respectively.