v0.12.0

* Fix typo in CLI options (#89)
* Make sure requests `Response` objects are properly closed
* Add a *batch mode* to download from several users / profiles
  using a configuration file
* Add a `__license__` field to `instaLooter.__init__`
* Use declarative-style `setup.cfg`
* Add setup extras (*test*, *doc*, *metadata*, *all*, *alldev*)
* Update README and documentation