Revert "web/postkey/views.py: remove unneeded import"

This reverts commit 01964a33f8.

Whoops, this import is not unneeded!

pyi2phosts/postkey/views.py

@@ -3,6 +3,7 @@ import re
 from django import forms
 from django.forms import ModelForm
 from django.shortcuts import render_to_response
+from django.http import HttpResponseRedirect
 from django.template import RequestContext
 
 import settings