Merge pull request #13 from nautilebleu/master

Django 1.5 compatibility for models and migrations
Dropped django.utils.simplejson in favour of system json
See https://docs.djangoproject.com/en/dev/releases/1.5/#system-version-of-simplejson-no-longer-used
Documented `APNService.push_notification_to_devices` method
Updated version to 0.1.4
Fixed typo in README
Don't write to stdout when management command run from tests
Updated datetime objects to be aware where possible
get_user_model should not be used with ManyToManyField

It may cause race conditions, with ios_notification
being loaded before app that defines custom user.

Signed-off-by: Fernando Rocha <fernandogrd@gmail.com>
Merge pull request #14 from fernandogrd/master

get_user_model should not be used with ManyToManyField
Fixed bug where calling feedback service was prompting for passphrase
Updated APNService to send notifications in chunks
Made BaseService connect and disconnect private methods
Removed unnecessary assert from test_pushing_notification_in_chunks
Removed default value for chunk_size from APNService._write_message
Disconnect from FeedbackService in finally clause
Readded accidentally removed comment
Updated documentation
Moved subprocess command in tests to class setup and teardown
Fixed method call to self._write_message
Removed time.sleep from tests setup