removed 1.4 incompabilities

when I installed the django 1.4 lib on my non-cloud hana instance I
received an import error for "from django.utils.safestring import
SafeText, SafeBytes" and "from django.utils import six". Therefore I
took them out. A quick check of the django docs gave me the impression
that those are 1.5 features
Update README.md
Update README.md
Merge pull request #7 from marcopashkov/master

1.4 incompatibilities