added textfixtures to test dependencies
added textfixtures to test dependencies
using .format() for string formatting
special test settings for postprocessor are part of the unit tests now
added special unit tests for postprocessor optimizer
Merge remote-tracking branch 'upstream/postprocessor' into postprocessor
Added shim for Python-2.6
Imports compatible with Python-3.3
Using exit status 1 to signal failure
Added configuration option to specify the infix used for high resolution image handling
Only testing Python 2.6+ now, since tox dropped it

Will try to keep Python 2.5 working, but it'll be up to people to nag if
it breaks.
Use Django's bundled six util
Avoid Python 3.3 deprecation warning for assertRegexpMatches
Small changes to optimize docs
Merge remote-tracking branch 'jrief/retina-display' into postprocessor
Note some changes