update test to handle IntegerField html change

With Django 1.6, the html output for IntegerField in django.forms
has changed. Providing a test to check for earlier Django versions
as well as Django 1.6.

Partially-implements blueprint django-1point6

Change-Id: If4e544788306e07b268a9ebb67a3284bc8879f26
Merge "update test to handle IntegerField html change"