updated gitignore
Added max file size validation to upload form
This can be controlled by a new setting "AJAX_UPLOAD_MAX_FILESIZE".
added settings template tag, updated tests
Updates test
Replaces simplejson with json
Updated REAdME
Increments version to 0.5.5
Update urls.py for Django 1.6 compatibility

django.conf.urls.defaults was deprecated some time back.
fixed deprecated import
Removes deprecated code
limit length of generated filenames
merged upstream
added setting to use image field on upload form
Merge remote-tracking branch 'upstream/master'

Conflicts:
	.gitignore
	ajax_upload/tests/tests.py
	ajax_upload/tests/urls.py
	ajax_upload/tests/views.py
	ajax_upload/urls.py
	ajax_upload/views.py