bug fix: removed \r in textversion's content because of a comment position bug in pre_edit. Added a save function to TextVersionManager to do so. Also removed cleaning \r before computing diffs because it should not be necessary anymore.

# django helpers collections
from django.conf import settings
from django.core.urlresolvers import reverse

def absolute_reverse(view_id, args):
    return settings.SITE_URL + reverse(view_id, args=args)