Fix the required Django version

Since the commit fc3f018544c19b90cc63797d18970a4cc27ef2ad graphite-web requires Django > 1.4
graphite-web has a dependency to ceres modules, not reflected here right now
Merge pull request #439 from marco-hoyer/patch-1

graphite-web has a dependency to ceres modules, not reflected here right...
Merge pull request #1 from graphite-project/master

Sync to master
Added loglines indicating search index generation time and size
Merge pull request #453 from drawks/master

Added loglines indicating search index generation time and size
Python 2.6 on Lucid doesn't like '{}.{}'.format(v1,v2)
Replaced with '{0}.{1}'.format(v1,v2)
Merge pull request #471 from dangarthwaite/fix_utils_empty_format

Python 2.6 on Lucid doesn't like '{}.{}'.format(v1,v2)
Merge pull request #438 from daccle/patch-1

Fix the required Django version
typo

i'm really hoping it's not spelled deriviative ;-)
Merge pull request #491 from davidascher/patch-1

typo