logging clean-up

- moved most constants to separate file
- sorted and cleaned-up imports
- moved logging setup to separate file

cps/redirect.py

@@ -28,10 +28,12 @@
 
 # http://flask.pocoo.org/snippets/62/
 
+from __future__ import division, print_function, unicode_literals
 try:
     from urllib.parse import urlparse, urljoin
 except ImportError:
     from urlparse import urlparse, urljoin
+
 from flask import request, url_for, redirect