ajax_request get FORMAT_TYPES from Settings if exists or default behaviour
added ability to define FORMAT_TYPES functions as string in settings
fix. settings.hasattr => hasattr(settings, ...)
back author in setup.py and added to AUTHORS.txt, fixed pep in decorators.py
importlib changed to __import__
Merge pull request #18 from Zanuda999/master

Master
Merge pull request #19 from skorokithakis/master

Merge to master