remove duplicate functionnality

compress/filters/css_url_replace/__init__.py

-import re
-from django.conf import settings
-
-from compress.filter_base import FilterBase
-
-CSS_REPLACE = getattr(settings, 'COMPRESS_CSS_URL_REPLACE', [])
-
-class CSSURLReplace(FilterBase):
-    def filter_css(self, css):
-        for pattern, repl in CSS_REPLACE.iteritems():
-            css = re.sub(pattern, repl, css)
-            if self.verbose:
-                print 'Replaced "%s" with "%s"' % (pattern, repl)
-        return css